If tan A = 3/4, find sin A.

$\tan A=\frac{3}{4}$
$\text{Opposite side}=3,\ \text{Adjacent side}=4$
$\text{Hypotenuse}=\sqrt{3^2+4^2}=5$
$\sin A=\frac{\text{Opposite}}{\text{Hypotenuse}}=\frac{3}{5}$