2=3.14*r2*

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Solution for 2=3.14*r2* equation: 



2=3.14r^2*

We move all terms to the left:

2-(3.14r^2*)=0

We get rid of parentheses

-3.14r^2*+2=0

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

-3.14r^2*=-2

r=-2/1

r=-2

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