5329.9616=4*3.14*r^2

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Solution for 5329.9616=4*3.14*r^2 equation: 


Simplifying
5329.9616 = 4 * 3.14r2

Multiply 4 * 3.14
5329.9616 = 12.56r2

Solving
5329.9616 = 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.
5329.9616 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
5329.9616 + -12.56r2 = 0.00

Add '-5329.9616' to each side of the equation.
5329.9616 + -5329.9616 + -12.56r2 = 0.00 + -5329.9616

Combine like terms: 5329.9616 + -5329.9616 = 0.0000
0.0000 + -12.56r2 = 0.00 + -5329.9616
-12.56r2 = 0.00 + -5329.9616

Combine like terms: 0.00 + -5329.9616 = -5329.9616
-12.56r2 = -5329.9616

Divide each side by '-12.56'.
r2 = 424.36

Simplifying
r2 = 424.36

Take the square root of each side:
r = {-20.6, 20.6}

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