S=4*3.14*r^2

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Solution for S=4*3.14*r^2 equation: 


Simplifying
S = 4 * 3.14r2

Multiply 4 * 3.14
S = 12.56r2

Solving
S = 12.56r2

Solving for variable 'S'.

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

Simplifying
S = 12.56r2

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