84.78=3.14*r^2*9

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Solution for 84.78=3.14*r^2*9 equation: 



84.78=3.14r^2*9

We move all terms to the left:

84.78-(3.14r^2*9)=0

We get rid of parentheses

-3.14r^2*9+84.78=0

We move all terms containing r to the left, all other terms to the right

-3.14r^2*9=-84.78

r=-84.78/1

r=-84.78

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