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2 years ago

12

Please answer this in two minutes

1 answer:

NeTakaya2 years ago

8 0

Answer:

15

Step-by-step explanation:

Use the Pythagorean Thereom:

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

$r^{2}$ = 81+144

$r^{2}$ = 225

$r$ = 15

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