3.14*r^2*56=9891

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Solution for 3.14*r^2*56=9891 equation: 


Simplifying
3.14r2 * 56 = 9891

Reorder the terms for easier multiplication:
3.14 * 56r2 = 9891

Multiply 3.14 * 56
175.84r2 = 9891

Solving
175.84r2 = 9891

Solving for variable 'r'.

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

Divide each side by '175.84'.
r2 = 56.25

Simplifying
r2 = 56.25

Take the square root of each side:
r = {-7.5, 7.5}

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