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pls help me with this

 Feb 21, 2018
 #1
avatar+99586 
+1

2.   

 

The perimeter  is 

 

2 ( 12 + 15)  =  2 (27)  =  54ft

 

The length of one diagonal  forms a hypotenuse of a right triangle  with legs of 12 and 15...its length is

 

sqrt  ( 12^2  + 15^2)  =   sqrt (144 + 225)  =  sqrt (289)  =  17 ft

 

And there are two diagonals so their combined length is  2 * 17  =  34 ft

 

So   .....  the total rolls she needs  is

 

[ 54 + 34 ]  / 20    =   88/ 20  = 4.4 rolls

 

But we can't purchase partial rolls...so.....she needs  5 rolls

 

 

cool cool cool

 Feb 21, 2018

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