Exercises 4.5. 1. Use Corollary 4.30 to find the area of the hyperbolic triangle with given vertices. (a) O = (0,0), P = (½,√√) and Q = (½, −√√). 12 (You should already know the angles from previous exercises!) (b) O=(0,0), P = = (1,0), Q = (0, 1). r r 3r (c) P = (r,0), Q = ( = ( — 12, ✓ 3³), R = ( — — 2, - √³) where 0 < r < 1. 2