Triangle A C B is shown. Angle A C B is a right angle. Altitude h is drawn from point C to point D on side A B. Line A D is labeled e, line D B is labeled f, side A B is labeled c, side A C is labeled b, and side C B is labeled a. In a proof of the Pythagorean theorem using similarity, what allows you to state that the triangles are similar in order to write the true proportions StartFraction c Over a EndFraction = StartFraction a Over f EndFraction and StartFraction c Over b EndFraction = StartFraction b Over e EndFraction? the geometric mean (altitude) theorem the geometric mean (leg) theorem the right triangle altitude theorem the SSS theorem