My Math Forum Elastic band

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 March 5th, 2017, 06:06 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 08:40 AM.
March 5th, 2017, 09:19 AM   #2
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$d = 2\, cm \implies r = 1 \, cm$ ...
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