113.04=3.14*r^2*9

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Solution for 113.04=3.14*r^2*9 equation: 


Simplifying
113.04 = 3.14r2 * 9

Reorder the terms for easier multiplication:
113.04 = 3.14 * 9r2

Multiply 3.14 * 9
113.04 = 28.26r2

Solving
113.04 = 28.26r2

Solving for variable 'r'.

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

Add '-28.26r2' to each side of the equation.
113.04 + -28.26r2 = 28.26r2 + -28.26r2

Combine like terms: 28.26r2 + -28.26r2 = 0.00
113.04 + -28.26r2 = 0.00

Add '-113.04' to each side of the equation.
113.04 + -113.04 + -28.26r2 = 0.00 + -113.04

Combine like terms: 113.04 + -113.04 = 0.00
0.00 + -28.26r2 = 0.00 + -113.04
-28.26r2 = 0.00 + -113.04

Combine like terms: 0.00 + -113.04 = -113.04
-28.26r2 = -113.04

Divide each side by '-28.26'.
r2 = 4

Simplifying
r2 = 4

Take the square root of each side:
r = {-2, 2}

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