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March 5th, 2017, 07:06 AM   #1
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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.
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March 5th, 2017, 10:19 AM   #2
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$d = 2\, cm \implies r = 1 \, cm$ ...
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