Answer:
15
Explanation:
a^2 + b^2 = c^2
9^2 + 12^2 = c^2
81+144 = c^2
225 = c^2
15 = c
15ft
12 or 9 can equal to b or a
12^2 + 9^2 = c^2
144 + 81 = c ^2
Square root of 225
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