s=2*3.14*r*r

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Solution for s=2*3.14*r*r equation: 


Simplifying
s = 2 * 3.14r * r

Multiply 2 * 3.14
s = 6.28r * r

Multiply r * r
s = 6.28r2

Solving
s = 6.28r2

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Simplifying
s = 6.28r2

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