Triangle PAR is isosceles, and m∠P = 15°. What are m∠A and m∠R?
a) m∠A = 82.5°, m∠R = 82.5°
b) m∠A = 15°, m∠R = 15°
c) m∠A = 75°, m∠R = 75°
d) m∠A = 90°, m∠R = 75°