SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Show the given right-angled triangle
STEP 2: Write the given values for the sides and the appropriate trigonemtric ratio to use

STEP 3: Get the third side
Since we were to find the sine of the given angle, we need to find the opposite to allow us use the trig ratio in step 2
![\begin{gathered} U\sin g\text{ pythagoras theorem,} \\ \text{hypotenuse}^2=opposite^2+adjacent^2 \\ \text{hypotenuse}^2-adjacent^2=opposite^2 \\ By\text{ substitution,} \\ 15^2-9^2=opposite^2 \\ \text{opposite}^2=225-81=144 \\ \text{opposite}=\sqrt[]{144}=12 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/a768g7i7zaqtty0oqy3whj8rf9ri458u0c.png)
STEP 4: Express the sine of the given angle

Hence, the sine of the angle is 12/15