2568.3944=4*3.14*r^2

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Solution for 2568.3944=4*3.14*r^2 equation: 


Simplifying
2568.3944 = 4 * 3.14r2

Multiply 4 * 3.14
2568.3944 = 12.56r2

Solving
2568.3944 = 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.
2568.3944 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
2568.3944 + -12.56r2 = 0.00

Add '-2568.3944' to each side of the equation.
2568.3944 + -2568.3944 + -12.56r2 = 0.00 + -2568.3944

Combine like terms: 2568.3944 + -2568.3944 = 0.0000
0.0000 + -12.56r2 = 0.00 + -2568.3944
-12.56r2 = 0.00 + -2568.3944

Combine like terms: 0.00 + -2568.3944 = -2568.3944
-12.56r2 = -2568.3944

Divide each side by '-12.56'.
r2 = 204.49

Simplifying
r2 = 204.49

Take the square root of each side:
r = {-14.3, 14.3}

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