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63.585=3.14r*r/4
We move all terms to the left:
63.585-(3.14r*r/4)=0
We add all the numbers together, and all the variables
-(+3.14r*r/4)+63.585=0
We get rid of parentheses
-3.14r*r/4+63.585=0
We multiply all the terms by the denominator
-3.14r*r+(63.585)*4=0
We add all the numbers together, and all the variables
-3.14r*r+254.34=0
We move all terms containing r to the left, all other terms to the right
-3.14r*r=-254.34
r=-254.34/1
r=-254.34
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