Explanation:
Familiar with Pyhtagorean theorem for right triangles ?
hypotenuse ^2 = leg1 ^2 + leg2^2
for this triangle:
13^2 = 9^2 + x^2
x^2 = 13^2 - 9^2
x^2 = 88
x = sqrt (88) = ~ 9.4 units
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