User:Eykca/Books/Triangles

Ideas of Interest

 * The Basics
 * Triangle
 * Pythagorean theorem


 * Area
 * Heron's formula
 * Pick's theorem


 * Centers
 * Triangle center
 * Centroid
 * Circumscribed circle
 * Incenter
 * Altitude (triangle)


 * Trigonometric Laws
 * Law of sines
 * Law of cosines
 * Law of tangents


 * Lesser Known Theorems
 * Euler's theorem in geometry
 * Morley's trisector theorem
 * Apollonius' theorem
 * Fermat point
 * Heronian triangle
 * Pedal triangle