137.9944=4*3.14*r^2

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Solution for 137.9944=4*3.14*r^2 equation: 


Simplifying
137.9944 = 4 * 3.14r2

Multiply 4 * 3.14
137.9944 = 12.56r2

Solving
137.9944 = 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.
137.9944 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
137.9944 + -12.56r2 = 0.00

Add '-137.9944' to each side of the equation.
137.9944 + -137.9944 + -12.56r2 = 0.00 + -137.9944

Combine like terms: 137.9944 + -137.9944 = 0.0000
0.0000 + -12.56r2 = 0.00 + -137.9944
-12.56r2 = 0.00 + -137.9944

Combine like terms: 0.00 + -137.9944 = -137.9944
-12.56r2 = -137.9944

Divide each side by '-12.56'.
r2 = 10.98681529

Simplifying
r2 = 10.98681529

Take the square root of each side:
r = {-3.314636525, 3.314636525}

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