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The height of a cylinder is increased by 40%.  What percent will the radius need to be decreased by, in order to keep the volume the same?

 May 21, 2020
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*** edited ***

Volume of cylinder =   pi r2  h     if   h is increased  by 1.4    

     r will have to decrease to   1.4 r^2 = 1  

      r = 84.5 per cent of original    or decreased by 15.48%

 May 21, 2020
edited by ElectricPavlov  May 21, 2020
edited by ElectricPavlov  May 21, 2020

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