Triangles

- Triangle definition
- Interior angles
- Exterior angles
- Exterior angle theorem
- Hypotenuse of a right triangle
- Medians of a triangle
- Altitudes of a triangle
- Midsegment of a triangle
- Triangle Inequality Theorem
- Converse of Triangle Inequality Theorem
- Side / angle relationships

- 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

- 45° 45° 90° right triangle
- 30° 60° 90° right triangle
- Pythagorean triples
- The 3:4:5 pythagorean triple

- Introduction. What does 'solving' a triangle mean?
- The Pythagorean Theorem and its converse
- A graphical proof of the Pythagorean Theorem
- Law of Sines
- Law of Cosines

(Points of concurrency)

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