pls help!!!!!!!!! if possible will mark brainliest!

Answer:
i think you may have to use sin or cos
Step-by-step explanation:
Answer:
9m (You were correct!!!!)
Step-by-step explanation:
Use Pythagorean Theorem:
[tex]a^{2} +b^{2} = c^{2}[/tex]
⬆️ ⬆️ ⬆️
legs hypotenuse
x² + 12² = 15²
x² + 144 = 225
x² = 81
x = 9