221.5584=4*3.14*r^2

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Solution for 221.5584=4*3.14*r^2 equation: 


Simplifying
221.5584 = 4 * 3.14r2

Multiply 4 * 3.14
221.5584 = 12.56r2

Solving
221.5584 = 12.56r2

Solving for variable 'r'.

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

Add '-12.56r2' to each side of the equation.
221.5584 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
221.5584 + -12.56r2 = 0.00

Add '-221.5584' to each side of the equation.
221.5584 + -221.5584 + -12.56r2 = 0.00 + -221.5584

Combine like terms: 221.5584 + -221.5584 = 0.0000
0.0000 + -12.56r2 = 0.00 + -221.5584
-12.56r2 = 0.00 + -221.5584

Combine like terms: 0.00 + -221.5584 = -221.5584
-12.56r2 = -221.5584

Divide each side by '-12.56'.
r2 = 17.64

Simplifying
r2 = 17.64

Take the square root of each side:
r = {-4.2, 4.2}

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