
Samantha B. answered 04/24/21
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First, use the Pythagorean Theorem too find the base length 15 is the hypotenuse and 12 is a leg, thus:
122 + x2 = 152
144 + x2 = 225
81 = x2
9=x
This is only half of the base, of course. The total base length is 18. Tot find the height, please see the video.