March 5th, 2017, 07:06 AM  #1 
Newbie Joined: Dec 2016 From: Venezuela Posts: 4 Thanks: 0  Elastic band
Joe wants to keep together six tubes of 2 cm Diameter through an elastic band. He considered the two possibilities shown in the figures: Which of the following statements about the length of the elastic band is true? A The one on the left is π cm shorter. B The one on the left is 4 cm shorter. C The one on the right is π cm shorter. D The one on the right is 4 cm shorter. E both have the same length. I know that both have the same length, but I don't know how to calculate the length of the bands. How is it calculated? Last edited by skipjack; March 5th, 2017 at 09:40 AM. 
March 5th, 2017, 10:19 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,549 Thanks: 1259 
$d = 2\, cm \implies r = 1 \, cm$ ...


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