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Math·Geometry and Trigonometry·Right triangles and trigonometry

easy

One angle is a right angle. The length of the side opposite the right angle is $r$. The lengths of the other $2$ sides are $9$ and $12$. Which equation gives the relationship between the side lengths of the triangle shown?

A

$9+12=r$

B

$12-9=r$

C

$9^2+12^2=r^2$

D

$12^2-9^2=r^2$