211.1336=4*3.14*r^2

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Solution for 211.1336=4*3.14*r^2 equation: 


Simplifying
211.1336 = 4 * 3.14r2

Multiply 4 * 3.14
211.1336 = 12.56r2

Solving
211.1336 = 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.
211.1336 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
211.1336 + -12.56r2 = 0.00

Add '-211.1336' to each side of the equation.
211.1336 + -211.1336 + -12.56r2 = 0.00 + -211.1336

Combine like terms: 211.1336 + -211.1336 = 0.0000
0.0000 + -12.56r2 = 0.00 + -211.1336
-12.56r2 = 0.00 + -211.1336

Combine like terms: 0.00 + -211.1336 = -211.1336
-12.56r2 = -211.1336

Divide each side by '-12.56'.
r2 = 16.81

Simplifying
r2 = 16.81

Take the square root of each side:
r = {-4.1, 4.1}

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