669.3224=4*3.14*r^2

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Solution for 669.3224=4*3.14*r^2 equation: 


Simplifying
669.3224 = 4 * 3.14r2

Multiply 4 * 3.14
669.3224 = 12.56r2

Solving
669.3224 = 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.
669.3224 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
669.3224 + -12.56r2 = 0.00

Add '-669.3224' to each side of the equation.
669.3224 + -669.3224 + -12.56r2 = 0.00 + -669.3224

Combine like terms: 669.3224 + -669.3224 = 0.0000
0.0000 + -12.56r2 = 0.00 + -669.3224
-12.56r2 = 0.00 + -669.3224

Combine like terms: 0.00 + -669.3224 = -669.3224
-12.56r2 = -669.3224

Divide each side by '-12.56'.
r2 = 53.29

Simplifying
r2 = 53.29

Take the square root of each side:
r = {-7.3, 7.3}

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