3.14*r^2*2=56.52

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Solution for 3.14*r^2*2=56.52 equation: 


Simplifying
3.14r2 * 2 = 56.52

Reorder the terms for easier multiplication:
3.14 * 2r2 = 56.52

Multiply 3.14 * 2
6.28r2 = 56.52

Solving
6.28r2 = 56.52

Solving for variable 'r'.

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

Divide each side by '6.28'.
r2 = 9

Simplifying
r2 = 9

Take the square root of each side:
r = {-3, 3}

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