452.16=3.14*r^2

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Solution for 452.16=3.14*r^2 equation: 


Simplifying
452.16 = 3.14r2

Solving
452.16 = 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.
452.16 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
452.16 + -3.14r2 = 0.00

Add '-452.16' to each side of the equation.
452.16 + -452.16 + -3.14r2 = 0.00 + -452.16

Combine like terms: 452.16 + -452.16 = 0.00
0.00 + -3.14r2 = 0.00 + -452.16
-3.14r2 = 0.00 + -452.16

Combine like terms: 0.00 + -452.16 = -452.16
-3.14r2 = -452.16

Divide each side by '-3.14'.
r2 = 144

Simplifying
r2 = 144

Take the square root of each side:
r = {-12, 12}

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