.13=3.14r^2

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Solution for .13=3.14r^2 equation: 


Simplifying
0.13 = 3.14r2

Solving
0.13 = 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.
0.13 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
0.13 + -3.14r2 = 0.00

Add '-0.13' to each side of the equation.
0.13 + -0.13 + -3.14r2 = 0.00 + -0.13

Combine like terms: 0.13 + -0.13 = 0.00
0.00 + -3.14r2 = 0.00 + -0.13
-3.14r2 = 0.00 + -0.13

Combine like terms: 0.00 + -0.13 = -0.13
-3.14r2 = -0.13

Divide each side by '-3.14'.
r2 = 0.04140127389

Simplifying
r2 = 0.04140127389

Take the square root of each side:
r = {-0.20347303, 0.20347303}

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