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Algebra 17 Online
OpenStudy (ineedhelponhw):

Formulas & Algebraic Expressions http://prntscr.com/4v69ol

TheSmartOne (thesmartone):

Just plug in r=8 and r=5 and find the difference...

TheSmartOne (thesmartone):

Or you can do (64-25)4pi=39x4pi=156pi

TheSmartOne (thesmartone):

So it would be B...

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