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A square is changed into a pentagon by building an equilateral triangle on top of it, as shown. By what percent does the perimeter increase going from the square to the pentagon?

 Apr 29, 2019
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Call the side of the square, s......so....its perimeter  = 4s

 

And the perometer of he pentagon  = 5s

 

So......the percent change is    [5 - 4] / 4  * 100%  =  (1/4) * 100%  =  25%

 

 

cool cool cool

 Apr 29, 2019

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