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A∆ TOP
Abscissa - Coordinates of a point Acute - Acute Angle definition - Acute triangle definition Adjacent - Adjacent Angles definition - Adjacent arcs definition - Adjacent sides definition Alternate - Alternate Exterior Angles definition - Alternate Interior Angles definition Altitude - Altitude definition - Area of a triangle (conventional method) - Heron's formula for the area of a triangle - Triangle definition Angle - Acute Angle definition - Adjacent Angles definition - Alternate Exterior Angles definition - Alternate Interior Angles definition - Angle bisector definition - Angle definition - Angle measure - degrees. - Angle Quiz 1 - Arc Central Angle - Arc Peripheral Angle - Central angle of a circle - Complementary Angles definition - Congruent Angles - Constructing a 30 degree angle with compass and straightedge - Constructing a 45 degree angle with compass and straightedge - Constructing a 60 degree angle with compass and straightedge - Copying an angle with compass and straightedge - Corresponding Angles definition - Exterior Angles of a Transversal definition - Full Angle definition - How to use a protractor - How to use a protractor to draw an angle - Included angle definition - Inscribed angle of a circle - Interior / exterior angles of a polygon - Interior Angles of a transversal definition - Interior of an angle definition - Linear Pair of Angles - Obtuse Angle definition - Polygon Exterior Angles - Reflex Angle definition - Right Angle definition - Straight Angle definition - Subtended angle definition - Supplementary Angles definition - Triangle exterior angles definition - Vertical Angles definition Annulus - Annulus definition - Area of an annulus Apothem - Apothem of a Regular Polygon Arc - Adjacent arcs definition - Arc Central Angle - Arc definition - Arc Length definition - Arc Peripheral Angle - Intercepted arc - Major and Minor Arcs - Radius of an Arc or Segment Area - Area enclosed by a circle - Area enclosed by an ellipse - Area of a circle segment - Area of a Kite - Area of a parallelogram. Definition and formula - Area of a rectangle. Definition and formula - Area of a square. Definition and formula - Area of a trapezoid. Definition and formula - Area of a triangle (conventional method) - Area of an annulus - Area of an Irregular Polygon - Heron's formula for the area of a triangle - Regular polygon area formula - Relationship of area and perimeter of a triangle - Rhombus area formula - Triangle similarity, ratios of area Axis - Introduction to Coordinate Geometry - Major / minor axis of an ellipse - Semi-major / semi-minor axis of an ellipse - The Coordinate Plane
B∆ TOP
Base - Area of a triangle (conventional method) - Base definition - Heron's formula for the area of a triangle - Triangle definition Biography - Biography of Euclid - Biography of Pythagoras - Biography of Thales Bisector - Angle bisector definition - Bisecting a line with compass and straightedge - Bisecting an angle with compass and straightedge - Line bisector definition - Perpendicular bisector definition
C∆ TOP
Calculator - Math / scientific calculator Center - Center of a Polygon - Finding the center of a circle (with any right-angled object) - Finding the center of a circle (with compass and straightedge) Central - Arc Central Angle - Central angle of a circle - Central Angle of a Polygon Central angle - Central Angle Theorem Centroid - Constructing the centroid of a triangle - Median of a triangle definition - Triangle Centers Overview - Triangle centroid definition Chord - Chord definition - Intersecting Chord Theorem Circle - Annulus definition - Arc definition - Area enclosed by a circle - Area of a circle segment - Area of an annulus - Central angle of a circle - Chord definition - Circle definition and properties - Circumcircle - Circumference (perimeter) of a circle definition - Concentric Circles - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Constructing a tangent to a circle - Constructing tangents through an external point - Diameter of a circle definition - Finding the center of a circle (with any right-angled object) - Finding the center of a circle (with compass and straightedge) - Incircle - Inscribed angle of a circle - Intersecting Chord Theorem - Intersecting Secant Theorem - Radius of a circle definition - Secant definition - Segment of a Circle - Tangent to a circle definition - Thales theorem Circumcenter - Constructing circumcenter of a triangle with compass and straightedge - Triangle Centers Overview - Triangle Circumcenter definition - Triangle circumcircle definition Circumcircle - Circumcircle - Circumcircle of a Regular Polygon - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Radius of a Regular Polygon - Triangle circumcircle definition Circumference - Circumference (perimeter) of a circle definition - Perimeter of an Ellipse Circumradius - Radius of a Regular Polygon - Triangle circumcircle definition Circumscribed - Circumcircle - Circumcircle of a Regular Polygon - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Triangle circumcircle definition Collinear - Collinear points definition Compass - Bisecting a line with compass and straightedge - Bisecting an angle with compass and straightedge - Constructing a 30 degree angle with compass and straightedge - Constructing a 30-60-90 triangle with compass and straightedge - Constructing a 45 degree angle with compass and straightedge - Constructing a 60 degree angle with compass and straightedge - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Constructing a parallel through a point with compass and straightedge - Constructing a perpendicular at a point on a line - Constructing a perpendicular at the end of a ray with compass and straightedge - Constructing a perpendicular from a line through a point - Constructing a tangent to a circle - Constructing an equilateral triangle - Constructing circumcenter of a triangle with compass and straightedge - Constructing tangents through an external point - Constructing the Incircle of a triangle - Constructing the centroid of a triangle - Constructing the Incenter of a triangle - Constructing the medians of a triangle - Constructing the orthocenter of a triangle - Construction overview - Copying a line segment with compass and straightedge - Copying an angle with compass and straightedge - Dividing a line segment into N equal parts with compass and straightedge - Finding the center of a circle (with compass and straightedge) - Isosceles triangle construction given base and a side - Isosceles triangle construction given base and altitude Complementary - Complementary Angles definition Concave - Concave Polygon Definition Concentric - Concentric Circles Congruent - AAS Congruent Triangles - ASA Congruent Triangles - Congruent Angles - Congruent definition - Congruent Lines Definition - Congruent Polygon Tests - Congruent Polygons - Congruent Triangles - HL Congruent Triangles - SAS Congruent Triangles - SSS Congruent Triangles Construction - Bisecting a line with compass and straightedge - Bisecting an angle with compass and straightedge - Construct a triangle given three sides - Construct a triangle given two angles and the included side - Construct a triangle given two sides and the included angle - Constructing an ellipse - Constructing a 30 degree angle with compass and straightedge - Constructing a 30-60-90 triangle with compass and straightedge - Constructing a 45 degree angle with compass and straightedge - Constructing a 60 degree angle with compass and straightedge - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Constructing a parallel through a point with compass and straightedge - Constructing a perpendicular at a point on a line - Constructing a perpendicular at the end of a ray with compass and straightedge - Constructing a perpendicular from a line through a point - Constructing a tangent to a circle - Constructing an equilateral triangle - Constructing circumcenter of a triangle with compass and straightedge - Constructing tangents through an external point - Constructing the Incircle of a triangle - Constructing the centroid of a triangle - Constructing the Incenter of a triangle - Constructing the medians of a triangle - Constructing the orthocenter of a triangle - Construction overview - Copying a line segment with compass and straightedge - Copying a triangle with compass and straightedge - Copying an angle with compass and straightedge - Dividing a line segment into N equal parts with compass and straightedge - Finding the foci an ellipse - Finding the center of a circle (with any right-angled object) - Finding the center of a circle (with compass and straightedge) - Isosceles triangle construction given base and a side - Isosceles triangle construction given base and altitude Convex - Convex Polygon Definition Coordinates - Coordinates of a point - Distance between points - Intercept (b) of a line (Coordinate Geometry) - Intercept (b) of a line (Coordinate Geometry) - Introduction to Coordinate Geometry - Line definition (Coordinate Geometry) - Line Segment definition (Coordinate Geometry) - Midpoint Theorem (Coordinate Geometry) - Ray definition (Coordinate Geometry) - Slope (m) of a line (Coordinate Geometry) - The Coordinate Plane Coplanar - Coplanar definition - Introduction to plane geometry Copy - Copying a line segment with compass and straightedge - Copying an angle with compass and straightedge Corresponding - Corresponding Angles definition Cos - Trigonometry Overview Cosine - Solving Triangles Cube - Cube definition and properties - Cube definition and properties - Volume of a cube Cubic - Cubic curve and graph display Cylinder - Volume of a cylinder
D∆ TOP
Decagon - Decagon definition Degrees - Angle measure - degrees. Diagonal - Polygon diagonals Diameter - Diameter of a circle definition - Thales theorem Distance - Distance between points Dodecagon - Dodecagon definition
E∆ TOP
Ellipse - Area enclosed by an ellipse - Constructing an ellipse - Ellipse definition and properties - Elliptical mirrors - Finding the foci an ellipse - Foci of an ellipse - Major / minor axis of an ellipse - Perimeter of an Ellipse - Semi-major / semi-minor axis of an ellipse - Tangent to an ellipse Endpoint - Line Segment Definition - Ray Definition Equation - Intercept (b) of a line (Coordinate Geometry) Equiangular polygon - Regular Polygon Definition Equidistant - Equidistant Points Equilateral - Constructing an equilateral triangle - Equilateral triangle definition Euclid - Biography of Euclid - Construction overview Exterior - Alternate Exterior Angles definition - Exterior Angles of a Transversal definition - Interior / exterior angles of a polygon - Polygon Exterior Angles - Triangle exterior angles definition
F∆ TOP
Foci - Ellipse definition and properties - Foci of an ellipse Focus - Ellipse definition and properties - Elliptical mirrors - Finding the foci an ellipse - Foci of an ellipse Formula - Regular polygon area formula - Rhombus area formula - Sides of a Polygon Full - Full Angle definition Function - Linear function graph display
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Golden - The Golden Rectangle definition Graph - Cubic curve and graph display - Linear function graph display - Quadratic curve and graph display
H∆ TOP
Heptagon - Heptagon definition Heron - Heron's formula for the area of a triangle Hexagon - Hexagon definition Hypotenuse - HL Congruent Triangles - Hypotenuse definition - Triangle definition
I∆ TOP
Incenter - Constructing the Incircle of a triangle - Constructing the Incenter of a triangle - Triangle Centers Overview - Triangle Incenter definition - Triangle incircle definition Incircle - Constructing the Incircle of a triangle - Constructing the Incenter of a triangle - Incircle - Incircle of a Polygon - Triangle incircle definition Included - Included angle definition - Included side definition Inequality - Triangle inequality theorem Inradius - Incircle of a Polygon - Triangle incircle definition Inscribed - Arc Peripheral Angle - Incircle - Inscribed angle of a circle - Triangle incircle definition Intercept - Intercept (b) of a line (Coordinate Geometry) - Intercepted arc Interior - Alternate Interior Angles definition - Interior / exterior angles of a polygon - Interior Angles of a transversal definition - Interior of an angle definition Interior angles - Polygon Interior Angles - Triangle interior angles definition Intersect - Definition of 'Intersection' - Intersecting Chord Theorem - Intersecting Secant Theorem Irregular - Area of an Irregular Polygon - Irregular Polygon Definition Isosceles - Isosceles triangle construction given base and a side - Isosceles triangle construction given base and altitude - Isosceles triangle definition
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K∆ TOP
Kite - Area of a Kite - Kite definition - Perimeter of a kite
L∆ TOP
Law of cosines - Solving Triangles Law of sines - Solving Triangles Leg - Angle definition Line - Congruent Lines Definition - Definition of 'Intersection' - Intercept (b) of a line (Coordinate Geometry) - Intercept (b) of a line (Coordinate Geometry) - Line bisector definition - Line Definition - Line definition (Coordinate Geometry) - Line Segment Definition - Line Segment definition (Coordinate Geometry) - Midpoint Theorem (Coordinate Geometry) - Parallel lines definition - Perpendicular bisector definition - Perpendicular definition - Ray Definition - Slope (m) of a line (Coordinate Geometry) - Slope (m) of a line (Coordinate Geometry) - Transversal Definition Linear - Linear function graph display - Linear Pair of Angles Locus - Locus
M∆ TOP
Major - Major / minor axis of an ellipse - Major and Minor Arcs - Semi-major / semi-minor axis of an ellipse Median - Constructing the medians of a triangle - Median of a triangle definition - Trapezoid median (midline, midsegment) definition Midline - Trapezoid median (midline, midsegment) definition Midpoint - Midpoint Definition - Midpoint Theorem (Coordinate Geometry) Midsegment - Trapezoid median (midline, midsegment) definition - Triangle midsegment definition Minor - Major / minor axis of an ellipse - Major and Minor Arcs - Semi-major / semi-minor axis of an ellipse Mirror - Elliptical mirrors
N∆ TOP
Nonagon - Nonagon Definition Normal - Perpendicular definition
O∆ TOP
Oblong - Rectangle definition Obtuse - Obtuse Angle definition - Obtuse triangle definition Octagon - Octagon Definition Opposite - Opposite Rays Definition - Vertical Angles definition Ordinate - Coordinates of a point Origin - Introduction to Coordinate Geometry - The Coordinate Plane Orthocenter - Constructing the orthocenter of a triangle - Orthocenter of a triangle - Triangle Centers Overview Orthogonal - Right Angle definition
P∆ TOP
Parallel - Constructing a parallel through a point with compass and straightedge - Parallel lines definition - Transversal Definition Parallelogram - Area of a parallelogram. Definition and formula - Parallelogram definition - Perimeter of a parallelogram Pentagon - Pentagon Definition Perimeter - Circumference (perimeter) of a circle definition - Perimeter of a kite - Perimeter of a parallelogram - Perimeter of a polygon - Perimeter of a rectangle - Perimeter of a rhombus - Perimeter of a square - Perimeter of a trapezoid - Perimeter of a triangle - Perimeter of an Ellipse - Relationship of area and perimeter of a triangle Peripheral - Arc Peripheral Angle Perpendicular - Constructing a perpendicular at a point on a line - Constructing a perpendicular at the end of a ray with compass and straightedge - Constructing a perpendicular from a line through a point - Perpendicular bisector definition - Perpendicular definition - Transversal Definition Pi - Area enclosed by a circle - Area enclosed by an ellipse - Area of an annulus - Definition of PI Plane - Coplanar definition - Definition of a plane - Introduction to Coordinate Geometry - Introduction to plane geometry - The Coordinate Plane Point - Collinear points definition - Coordinates of a point - Distance between points - Equidistant Points - Introduction to Coordinate Geometry - Locus - Point Definition Polygon - Apothem of a Regular Polygon - Area of an Irregular Polygon - Center of a Polygon - Central Angle of a Polygon - Circumcircle of a Regular Polygon - Concave Polygon Definition - Congruent Polygon Tests - Congruent Polygons - Convex Polygon Definition - Decagon definition - Dodecagon definition - Heptagon definition - Hexagon definition - Incircle of a Polygon - Interior / exterior angles of a polygon - Irregular Polygon Definition - Nonagon Definition - Octagon Definition - Pentagon Definition - Perimeter of a polygon - Polygon definition - Polygon diagonals - Polygon Exterior Angles - Polygon Interior Angles - Radius of a Regular Polygon - Regular polygon area formula - Regular Polygon Definition - Sides of a Polygon - Similar polygons and triangles defined - Tetragon Definition - Triangles of a Polygon - Undecagon Definition Problems - The 'Ball Box' math problem - The 'Many Triangles' math problem - The 'Three Satellites' triangle math problem Proof - Pythagoras Theorem Proof Protractor - How to use a protractor - How to use a protractor to draw an angle - Protractor description Pythagoras - 30-60-90 triangle definition - 3:4:5 triangle definition - 45-45-90 triangle definition - Biography of Pythagoras - Distance between points - Pythagoras Theorem Proof - Pythagoras' Theorem - Pythagorean triples triangle definition - Solving Triangles
Q∆ TOP
QED - Q.E.D. definition Quadrangle - Definition of a Square - Quadrilateral (also: tetragon, quadrangle) definition - Rectangle definition Quadrant - The Coordinate Plane Quadratic - Quadratic curve and graph display Quadrilateral - Area of a Kite - Definition of a Square - Kite definition - Parallelogram definition - Quadrilateral (also: tetragon, quadrangle) definition - Rectangle definition - Rhombus definition - Trapezium definition - Trapezoid definition Quiz - Angle Quiz 1 - Triangle Quiz 1
R∆ TOP
Radians - Angle measure - degrees. Radius - Circumcircle of a Regular Polygon - Circumference (perimeter) of a circle definition - Radius of a circle definition - Radius of a Regular Polygon - Radius of an Arc or Segment Ray - Opposite Rays Definition - Ray Definition - Ray definition (Coordinate Geometry) Rectangle - Area of a rectangle. Definition and formula - Perimeter of a rectangle - Rectangle definition - Rectangles and International paper sizes - The Golden Rectangle definition Reflex - Reflex Angle definition Regular - Regular Polygon Definition Regular polygon - Regular polygon area formula Rhombus - Perimeter of a rhombus - Rhombus area formula - Rhombus definition Right - Pythagoras' Theorem - Right Angle definition - Right triangle definition Right angle - Perpendicular definition
S∆ TOP
Scalene - Scalene triangle definition Secant - Chord definition - Intersecting Secant Theorem - Secant definition Sector - Sector definition Segment - Area of a circle segment - Copying a line segment with compass and straightedge - Dividing a line segment into N equal parts with compass and straightedge - Line Segment Definition - Line Segment definition (Coordinate Geometry) - Midpoint Theorem (Coordinate Geometry) - Radius of an Arc or Segment - Segment of a Circle Semi - Semi-major / semi-minor axis of an ellipse Side - Adjacent sides definition - Included side definition - SAS Triangle similarity test - Sides of a Polygon - SSS Congruent Triangles - SSS Triangle similarity test Similar - AAA Triangle similarity test - SAS Triangle similarity test - Similar polygons and triangles defined - Similar Triangles - SSS Triangle similarity test - Triangle similarity, ratios of area - Triangle similarity, ratios of parts Sin - Trigonometry Overview Sine - Solving Triangles Slope - Slope (m) of a line (Coordinate Geometry) Square - Area of a square. Definition and formula - Definition of a Square - Perimeter of a square Straight - Straight Angle definition Straightedge - Bisecting a line with compass and straightedge - Bisecting an angle with compass and straightedge - Construct a triangle given three sides - Construct a triangle given two angles and the included side - Construct a triangle given two sides and the included angle - Constructing a 30 degree angle with compass and straightedge - Constructing a 30-60-90 triangle with compass and straightedge - Constructing a 45 degree angle with compass and straightedge - Constructing a 60 degree angle with compass and straightedge - Constructing a circle through 3 points with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Constructing a parallel through a point with compass and straightedge - Constructing a perpendicular at a point on a line - Constructing a perpendicular at the end of a ray with compass and straightedge - Constructing a perpendicular from a line through a point - Constructing a tangent to a circle - Constructing an equilateral triangle - Constructing circumcenter of a triangle with compass and straightedge - Constructing tangents through an external point - Constructing the Incircle of a triangle - Constructing the centroid of a triangle - Constructing the Incenter of a triangle - Constructing the medians of a triangle - Constructing the orthocenter of a triangle - Construction overview - Copying a line segment with compass and straightedge - Copying a triangle with compass and straightedge - Copying an angle with compass and straightedge - Dividing a line segment into N equal parts with compass and straightedge - Finding the center of a circle (with compass and straightedge) - Isosceles triangle construction given base and a side - Isosceles triangle construction given base and altitude Subtended - Subtended angle definition Supplementary - Supplementary Angles definition
T∆ TOP
Tan - Trigonometry Overview Tangent - Constructing a tangent to a circle - Constructing tangents through an external point - Tangent to a circle definition - Tangent to an ellipse Tetragon - Quadrilateral (also: tetragon, quadrangle) definition - Tetragon Definition Thales - Biography of Thales - Thales theorem Theorem - Biography of Pythagoras - Biography of Thales - Central Angle Theorem - Thales theorem - Triangle inequality theorem Tools - Cubic curve and graph display - Linear function graph display - Quadratic curve and graph display Transversal - Exterior Angles of a Transversal definition - Interior Angles of a transversal definition - Transversal Definition Trapezium - Trapezium definition Trapezoid - Area of a trapezoid. Definition and formula - Perimeter of a trapezoid - Trapezoid definition - Trapezoid median (midline, midsegment) definition Triangle - 30-60-90 triangle definition - 3:4:5 triangle definition - 45-45-90 triangle definition - AAA Triangle similarity test - AAS Congruent Triangles - Acute triangle definition - Altitude definition - Area of a triangle (conventional method) - ASA Congruent Triangles - Base definition - Congruent Triangles - Construct a triangle given three sides - Construct a triangle given two angles and the included side - Construct a triangle given two sides and the included angle - Constructing a 30-60-90 triangle with compass and straightedge - Constructing a circle through the 3 vertices of a triangle with compass and straightedge - Constructing an equilateral triangle - Constructing circumcenter of a triangle with compass and straightedge - Constructing the Incircle of a triangle - Constructing the centroid of a triangle - Constructing the Incenter of a triangle - Constructing the medians of a triangle - Constructing the orthocenter of a triangle - Copying a triangle with compass and straightedge - Equilateral triangle definition - Heron's formula for the area of a triangle - HL Congruent Triangles - Hypotenuse definition - Isosceles triangle construction given base and a side - Isosceles triangle construction given base and altitude - Isosceles triangle definition - Median of a triangle definition - Obtuse triangle definition - Orthocenter of a triangle - Perimeter of a triangle - Pythagoras Theorem Proof - Pythagoras' Theorem - Pythagorean triples triangle definition - Right triangle definition - SAS Congruent Triangles - SAS Triangle similarity test - Scalene triangle definition - Similar Triangles - Solving Triangles - SSS Congruent Triangles - SSS Triangle similarity test - Triangle Centers Overview - Triangle centroid definition - Triangle Circumcenter definition - Triangle circumcircle definition - Triangle definition - Triangle exterior angles definition - Triangle Incenter definition - Triangle incircle definition - Triangle inequality theorem - Triangle interior angles definition - Triangle midsegment definition - Triangle Quiz 1 - Triangle similarity, ratios of area - Triangle similarity, ratios of parts - Triangles of a Polygon Trigonometry - Trigonometry Overview Trinagle - Relationship of area and perimeter of a triangle Triples - Pythagorean triples triangle definition
U∆ TOP
Undecagon - Undecagon Definition
V∆ TOP
Vertex - Angle definition - Triangle definition - Vertex definition Vertical - Vertical Angles definition Vertices - Vertex definition Volume - Volume of a cube - Volume of a cylinder
W∆ TOP
Worksheet - Worksheet - bisect angle - Worksheet - Circle through 3 points - Worksheet - Construct 30-60-90 triangles - Worksheet - Construct a 45 degree angle - Worksheet - Construct a 60 degree angle - Worksheet - Construct a 60 degree angle - Worksheet - Construct a copy of a given angle - Worksheet - Construct a copy of a given line segment - Worksheet - Construct a copy of a given triangle - Worksheet - Construct a parallel through a point - Worksheet - Construct a perpendicular from a point on the line - Worksheet - Construct a perpendicular through a point - Worksheet - Construct a tangent through a point on the circle - Worksheet - Construct a triangle given one side and two adjacent angles - Worksheet - Construct a triangle given three sides - Worksheet - Construct a triangle given two sides and the included angle measure - Worksheet - Construct equilateral triangle - Worksheet - Construct incenter of a triangle - Worksheet - Construct incircle of a triangle - Worksheet - Construct isosceles triangle - Worksheet - Construct isosceles triangle - Worksheet - Construct median of a triangle - Worksheet - Construct tangent through a point - Worksheet - Construct the centroid of a triangle - Worksheet - Construct the circumcenter of a triangle - Worksheet - Construct the circumcircle of a triangle - Worksheet - Divide a line segment into N parts - Worksheet - Draw an ellipse inside a rectangle - Worksheet - Draw angles with a protractor - Worksheet - Find the foci of a given ellipse - Worksheet - Finding center of a circle - Worksheet - Orthocenter of a triangle - Worksheet - perpendicular from endpoint of a ray - Worksheet - Perpendicular line bisector - Worksheet - Using a protractor to measure angles
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