Respuesta :

kitty420
The unknown side (PR) is 72 (42^2+58^2=5,128, square root of 5,128 which is 71.6, but rounds up to 72)
Angle Q is 90
(I don't have correct calculator for the other angles)
Angle P is 58/72=Answer, sin-1answer

Angle R is 42/72=Answer, sin-1answer