Answer:
12 cm
Explanation:
We can find the height of the triangle by using the Pythagorean theorem.
a^2 + b^2 = c^2 where a and b are the legs and c is the hypotenuse
9^2 + h^2 = 15^2
81 + h^2 = 225
h^2 = 225-81
h^2=144
Take the square root of each side.
h = 12