13=3.14r^2

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Solution for 13=3.14r^2 equation: 


Simplifying
13 = 3.14r2

Solving
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.
13 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
13 + -3.14r2 = 0.00

Add '-13' to each side of the equation.
13 + -13 + -3.14r2 = 0.00 + -13

Combine like terms: 13 + -13 = 0
0 + -3.14r2 = 0.00 + -13
-3.14r2 = 0.00 + -13

Combine like terms: 0.00 + -13 = -13
-3.14r2 = -13

Divide each side by '-3.14'.
r2 = 4.140127389

Simplifying
r2 = 4.140127389

Take the square root of each side:
r = {-2.034730299, 2.034730299}

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