This document discusses theorems and corollaries about right triangles. It states that if an altitude is drawn to the hypotenuse of a right triangle, the two triangles formed are similar. It also states that the length of the altitude is the geometric mean between the segments of the hypotenuse, and each leg is the geometric mean between the hypotenuse and adjacent hypotenuse segment. Students are assigned homework problems involving finding geometric means and values of unknowns in right triangles.