Think of a 5-12-13 triangle (that’s one of the Pythagorean triples you should know).

Say angle *A* measures *x*°, which would make angle *C* measure (90 – *x*)°. (I’m choosing those based on the fact that I already know that the sine of angle *C* will be 12/13.)

Now that we’ve got it set up, all we need to do is SOH-CAH-TOA it: sin *x*° = 5/13.

from Tumblr https://ift.tt/2vDcGUe