Chapter 1: Right Triangles and an Introduction to Trigonometry
( \newcommand{\kernel}{\mathrm{null}\,}\)
Thumbnail: Diagram of two congruent triangles. △ ABC≅ △ DEF (CC BY-SA; Merovingian via Wikipedia)
( \newcommand{\kernel}{\mathrm{null}\,}\)
Thumbnail: Diagram of two congruent triangles. △ ABC≅ △ DEF (CC BY-SA; Merovingian via Wikipedia)