Question

Please answer this question I have a test tomorrow...

Answer 1

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♦ Circles ♦

◘ A little manipulation of the diagram ( as shown in the pic ) 

Once you're done with this simple manipulation and the labeling, we get the equation : OB² + BC² = OC²

 • r² = ( r - 9 )² + 15² 

Solve this trivial equation to get : r = 17 

 • Radius = 17 is your final answer .
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Hope this helps