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Index
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Triangles
Triangle definition
Interior angles
Exterior angles
Hypotenuse of a right triangle
Medians of a triangle
Midsegment of a triangle
Triangle Inequality Theorem
Side / angle relationships
Triangle Perimeter and Area
Perimeter of a triangle
Area by the "half base times height" method
Area using Heron's formula
Area of an equilateral triangle
Area by the "side angle side" method
Area of a triangle with fixed perimeter
Types of triangle
Acute
Obtuse
Isosceles
Scalene
Equilateral
Equiangular
Right triangle
Special right triangles
45° 45° 90° right triangle
30° 60° 90° right triangle
Pythagorean triples
The 3:4:5 pythagorean triple
Solving the triangle
Introduction. What does 'solving' a triangle mean?
The Pythagorean Theorem and it's converse
A graphical proof of the Pythagorean Theorem
Law of Sines
Law of Cosines
Congruent triangles
See Congruence Chapter
The Centers of a Triangle
(Points of concurrency)
Triangle centers - an overview
Centroid
Circumcenter
Incenter
Orthocenter
Euler line
The Circles of a Triangle
Incircle
Circumcircle
Triangle problems
Quiz: Test your knowledge of triangle types
The "Many Triangles" problem
The "Ball Box" problem
The "Three Satellites" problem
(C) 2009 Copyright John Page
