The hypotenuse of a right-angled triangle is 12 cm. The side opposite to angle M is 9 cm. Find the sine of angle M.

Step 1: Identify the given information.
The figure shows a right-angled triangle.
The hypotenuse is $12 \text{ cm}$.
The side opposite to the angle $M^\circ$ is $9 \text{ cm}$.

Step 2: Apply the sine trigonometric ratio.
The sine of an angle in a right-angled triangle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse.

$$\sin(M^\circ) = \frac{\text{opposite}}{\text{hypotenuse}}$$

Substitute the given values:

$$\sin(M^\circ) = \frac{9 \text{ cm}}{12 \text{ cm}}$$ $$$$