Posted by hard questions PLZZ answer! on Thursday, November 29, 2012 at 4:40pm.
9^2 + x^2 = 15^2
81 + x^2 = 225
x^2 = 144
x = 12
or, since you are familiar with the 3-4-5 right triangle, you might have noticed that
9 = 3x3
15 = 3x5
so the other leg would be 3x4 = 12
Use the Pythagorean Theorem.
a^2 + b^2 = c^2
a^2 + 9^2 = 15^2
Solve for a.
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