find: sin a\nthe figure is not drawn to scale.

Explanation:

Step1: Recall the sine formula

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

Step2: Identify the sides for angle (A)

For angle (A), the opposite side is (7) and the hypotenuse is (25). So, $\sin A=\frac{7}{25}$.

Answer:

$\frac{7}{25}$