Perhaps you have

because[A]^2 + because[B]^2 + because[C]^2 = 1

Two of the angles must be complements of each other. The third angle will be a right angle (90°). The equation is symmetrical in all of the variables, so you can choose angle A to be anything you like in the range 0 to 90°.

because[A]^2 + because[B]^2 + because[C]^2 = 1

Two of the angles must be complements of each other. The third angle will be a right angle (90°). The equation is symmetrical in all of the variables, so you can choose angle A to be anything you like in the range 0 to 90°.