Step-by-step explanation: How I remember it is by using SOHCAHTOA. Sin Opposite Hypotenuse, Cos Adjacent Hypotenuse, then Tan Opposite Adjacent. In this case, we are finding the tan of C. The opposite side of c is 8, and the adjacent side of c is 15. You know this because the hypotenuse is always the longest side. Therefore, tan C is 8/15.
