125.6=3.14*r^2

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Solution for 125.6=3.14*r^2 equation: 


Simplifying
125.6 = 3.14r2

Solving
125.6 = 3.14r2

Solving for variable 'r'.

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

Add '-3.14r2' to each side of the equation.
125.6 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
125.6 + -3.14r2 = 0.00

Add '-125.6' to each side of the equation.
125.6 + -125.6 + -3.14r2 = 0.00 + -125.6

Combine like terms: 125.6 + -125.6 = 0.0
0.0 + -3.14r2 = 0.00 + -125.6
-3.14r2 = 0.00 + -125.6

Combine like terms: 0.00 + -125.6 = -125.6
-3.14r2 = -125.6

Divide each side by '-3.14'.
r2 = 40

Simplifying
r2 = 40

Take the square root of each side:
r = {-6.32455532, 6.32455532}

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