*Find sin A*.

The sine of an angle is defined as the ratio of the side opposite the angle to the hypotenuse.

x is labeled the hypotenuse therefore use the pythagorean theorem to find x.

15^2 + 36^2 = x^2

`x =sqrt(36^2 + 15^2) = 39`

x = 39

**The solution is sin A = `15/39` = `5/13.`**

**sin A = `5/13.`**