V=3*3.14*r^2

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Solution for V=3*3.14*r^2 equation: 



=3*3.14V^2

We move all terms to the left:

-(3*3.14V^2)=0

We get rid of parentheses

-3*3.14V^2=0

Wy multiply elements

-9V=0

V=0/-9

V=0

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