10130.3936=4*3.14*r^2

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Solution for 10130.3936=4*3.14*r^2 equation: 


Simplifying
10130.3936 = 4 * 3.14r2

Multiply 4 * 3.14
10130.3936 = 12.56r2

Solving
10130.3936 = 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.
10130.3936 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
10130.3936 + -12.56r2 = 0.00

Add '-10130.3936' to each side of the equation.
10130.3936 + -10130.3936 + -12.56r2 = 0.00 + -10130.3936

Combine like terms: 10130.3936 + -10130.3936 = 0.0000
0.0000 + -12.56r2 = 0.00 + -10130.3936
-12.56r2 = 0.00 + -10130.3936

Combine like terms: 0.00 + -10130.3936 = -10130.3936
-12.56r2 = -10130.3936

Divide each side by '-12.56'.
r2 = 806.56

Simplifying
r2 = 806.56

Take the square root of each side:
r = {-28.4, 28.4}

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