Question

what is sin a? sin a = ?

Explanation:

Step1: Recall sine - definition

In a right - triangle, $\sin A=\frac{\text{opposite}}{\text{hypotenuse}}$.

Step2: Identify opposite and hypotenuse

The side opposite to angle $A$ has length $13$, and the hypotenuse has length $16$.

Answer:

$\frac{13}{16}$