Concurrent lines - lines that intersect at a single point

Definition of a congruent line segments

Definition of the intersection of two lines

Three methods are discussed for finding the distance from a point to a line in coordinate geometry

A method for finding the distance from a point to a line in coordinate geometry using a formula

A method for finding the distance from a point to a line in coordinate geometry using trigonometry

A method for finding the distance from a point to a line in coordinate geometry using two line equations

A method for finding the distance from a point to a vertical or horizontal line in coordinate geometry

Definiton of the equation of a straight line, in 'point - slope' form: y = m(x-Px) + Py

Definiton of the equation of a straight line, in 'slope and intercept' form: y = mx+b

Animation showing that in any triangle, the centroid, circumcenter and orthocenter are always collinear - they always lie on a straight line, called the Euler line.

Definition of 'horizontal' and comparison to its cousn 'vertical'

Definiton and equation for a horizontal line in coordinate geometry

How to find the intercept of a line, given the coordinates of two points on the line

Determining where two straight lines intersect in coordinate geometry

Introduction to the concept of lines in coordinate geometry.

Definition of a line

Definition of a line when the defining points are on the coordinate plane

Definition of 'Line Bisector' and a general discussion of bisection. Link to 'angle bisector'

Definition of a line segment, a line linking two points.

Definition of a line segment when the defining points are on the coordinate plane

Finding the midpoint of a line segment given the coordinates of the endpoints

Definition and properties of parallel lines

How to determine if lines are parallel in coordinate geometry

Definition of 'Perpendicular Bisector'

Perpendicular definition: Perpendicular simply means 'at right angles'. A line is perpendicular to another if they meet at 90 degrees.

How to determine if lines are perpendicular in coordinate geometry

Definition of a ray - a type of line.

Reflection - a transformation that creates a mirror image of a line segment

Definition of the slope of a line given the coordinates of two points on the line, includes slope as a ratio and an angle.

Definition of the slope of a line given the coordinates of two points on the line, includes slope as a ratio and an angle.

Definition and properties of a tangent

Definition of a transversal. A line that cuts across two or more (usually parallel) lines. Also perpendicular transversal

Definition of 'vertical' and comparison to its cousin 'horizontal'

Definiton and equation for a vertical line in coordinate geometry