Think of a 5-12-13 triangle (that’s one of the Pythagorean triples you should know).
![image](https://i0.wp.com/78.media.tumblr.com/051b387fec965d5e9f2735d532a02d72/tumblr_inline_pdbawoDLLo1qio24w_540.png?w=852&ssl=1)
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.)
![image](https://i0.wp.com/78.media.tumblr.com/bdefe707c736ae1bd2211c80d2f14938/tumblr_inline_pdbb0x10cP1qio24w_540.png?w=852&ssl=1)
Now that we’ve got it set up, all we need to do is SOH-CAH-TOA it: sin x° = 5/13.
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