A right triangle has legs of length 9 and 12. What is the length of the hypotenuse?
A$13$
B$15$
C$21$
D$10.5$
Answer & Solution
Correct answer: B. $15$
$a^2 + b^2 = c^2 \Rightarrow 9^2 + 12^2 = 81 + 144 = 225 = c^2$. So $c = 15$.
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