289.3824=4*3.14r^2

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Solution for 289.3824=4*3.14r^2 equation: 


Simplifying
289.3824 = 4 * 3.14r2

Multiply 4 * 3.14
289.3824 = 12.56r2

Solving
289.3824 = 12.56r2

Solving for variable 'r'.

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

Add '-12.56r2' to each side of the equation.
289.3824 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
289.3824 + -12.56r2 = 0.00

Add '-289.3824' to each side of the equation.
289.3824 + -289.3824 + -12.56r2 = 0.00 + -289.3824

Combine like terms: 289.3824 + -289.3824 = 0.0000
0.0000 + -12.56r2 = 0.00 + -289.3824
-12.56r2 = 0.00 + -289.3824

Combine like terms: 0.00 + -289.3824 = -289.3824
-12.56r2 = -289.3824

Divide each side by '-12.56'.
r2 = 23.04

Simplifying
r2 = 23.04

Take the square root of each side:
r = {-4.8, 4.8}

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