163229.76=4*3.14*r*r

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Solution for 163229.76=4*3.14*r*r equation: 


Simplifying
163229.76 = 4 * 3.14r * r

Multiply 4 * 3.14
163229.76 = 12.56r * r

Multiply r * r
163229.76 = 12.56r2

Solving
163229.76 = 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.
163229.76 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
163229.76 + -12.56r2 = 0.00

Add '-163229.76' to each side of the equation.
163229.76 + -163229.76 + -12.56r2 = 0.00 + -163229.76

Combine like terms: 163229.76 + -163229.76 = 0.00
0.00 + -12.56r2 = 0.00 + -163229.76
-12.56r2 = 0.00 + -163229.76

Combine like terms: 0.00 + -163229.76 = -163229.76
-12.56r2 = -163229.76

Divide each side by '-12.56'.
r2 = 12996

Simplifying
r2 = 12996

Take the square root of each side:
r = {-114, 114}

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