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The formula for calculating the surface area of a cone is A=πr^2 + πrl, where ''l'' represents the lateral area. Solve the formula for  l.

 Apr 13, 2018
 #1
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 A=πr^2 + πrl        subtract   πr^2  from each side

 

A - πr^2   = πrl        divide both sides by πr

 

[ A - πr^2 ]  /  [ πr ]    =  l

 

 

cool cool cool

 Apr 13, 2018

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