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Four pencils are held together with a band.

 

 Apr 25, 2020
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The four curved lengths of the band form one circle:  C  =  pi ·10.

The four straight line segements go from the center on one circle to the center of the next circle; each one  = 10

 

So:  pi · 10  +  4 · 10

 Apr 25, 2020

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