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the radius of the circular lens of a magnifying glass is 4 centmeters . whats the circumfernce? leave you answer in terms of pi

 Feb 29, 2016
 #1
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the formula is c=pi·d

or c=pi·r^2

 Feb 29, 2016
 #2
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the anwser is 8pi or 25.1327412287183459

 Feb 29, 2016

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