Using similarity solve for x. show all work

To find x, let the altitude=h
First find h.
h²= 9 x 16
h²=144
Take square root.
h=12
Now to find x, we use Pythagorean theorem.
c²=a²+b²
Put values
x²=9²+12²
x²=81+144
x²=225
Take square root.
x=15

x=15

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