10345.5464=4*3.14*r^2

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Solution for 10345.5464=4*3.14*r^2 equation: 


Simplifying
10345.5464 = 4 * 3.14r2

Multiply 4 * 3.14
10345.5464 = 12.56r2

Solving
10345.5464 = 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.
10345.5464 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
10345.5464 + -12.56r2 = 0.00

Add '-10345.5464' to each side of the equation.
10345.5464 + -10345.5464 + -12.56r2 = 0.00 + -10345.5464

Combine like terms: 10345.5464 + -10345.5464 = 0.0000
0.0000 + -12.56r2 = 0.00 + -10345.5464
-12.56r2 = 0.00 + -10345.5464

Combine like terms: 0.00 + -10345.5464 = -10345.5464
-12.56r2 = -10345.5464

Divide each side by '-12.56'.
r2 = 823.69

Simplifying
r2 = 823.69

Take the square root of each side:
r = {-28.7, 28.7}

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