Show every m Mb+ (H) is a composition of at most three reflections. (a) Show that the three angle bisectors of T meet at a single point. (b) If each side of T has the same length, then show that interior angles of T are equal. Moreover, if a is the interior of T at a vertex and a is the length of each side, then prove that 2 cosh (2) sin() (-) = 1.