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1.The figure shows the dimensions of the rectangular ceiling of Katie’s living room. To decorate for a party, she plans to hang crepe paper around the perimeter of the ceiling and from each corner to the opposite corner. Katie can buy rolls that each contain 20 ft of crepe paper. What is the minimum number of rolls she should buy? Show your work.

Guest Apr 17, 2017
 #1
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This is the picture for the problem

Guest Apr 17, 2017
 #2
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The total for the perimeter  = 2 (12 + 15)   =  54 ft

 

The total for 2 diagonals  = 2sqrt (12^2 + 15^2)  =  2sqrt (369)  ≈ 38.4 ft

 

No. of rolls required   =  (54 + 38.4)  / 20   =  4.63 rolls   =  round up to 5 rolls

 

 

 

cool cool cool

CPhill  Apr 17, 2017

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