289.3824=3.14*r^2

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Solution for 289.3824=3.14*r^2 equation: 


Simplifying
289.3824 = 3.14r2

Solving
289.3824 = 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.
289.3824 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
289.3824 + -3.14r2 = 0.00

Add '-289.3824' to each side of the equation.
289.3824 + -289.3824 + -3.14r2 = 0.00 + -289.3824

Combine like terms: 289.3824 + -289.3824 = 0.0000
0.0000 + -3.14r2 = 0.00 + -289.3824
-3.14r2 = 0.00 + -289.3824

Combine like terms: 0.00 + -289.3824 = -289.3824
-3.14r2 = -289.3824

Divide each side by '-3.14'.
r2 = 92.16

Simplifying
r2 = 92.16

Take the square root of each side:
r = {-9.6, 9.6}

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