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http://prntscr.com/lh3wt9

 Nov 11, 2018
 #1
avatar+107405 
+2

sqrt ( p + a)  + r  = k       subtract r from both sides

 

sqrt ( p + a)  =  k  - r      square both sides

 

p + a  =  ( k - r)^2

 

p + a  =  k^2 - 2kr + r^2      subtract p from both sides

 

a  =  k^2  - 2kr   + r^2  - p

 

 

cool cool cool

 Nov 11, 2018

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