Given two angles and the hypotenuse of a right triangle, when trying to find the length of the side opposite the given angle, why and how does it's angle and supplementary angle yield the same answer?
For example. Right triangle
hypotenuse = 5
angle = 77
opposite side = sine (77) * 5 = 4.87185032
supplementary angle of 77 = 103
opposite side = sine (103) * 5 = 4.87185032