5644.9664=4*3.13*r^2

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Solution for 5644.9664=4*3.13*r^2 equation: 


Simplifying
5644.9664 = 4 * 3.13r2

Multiply 4 * 3.13
5644.9664 = 12.52r2

Solving
5644.9664 = 12.52r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12.52r2' to each side of the equation.
5644.9664 + -12.52r2 = 12.52r2 + -12.52r2

Combine like terms: 12.52r2 + -12.52r2 = 0.00
5644.9664 + -12.52r2 = 0.00

Add '-5644.9664' to each side of the equation.
5644.9664 + -5644.9664 + -12.52r2 = 0.00 + -5644.9664

Combine like terms: 5644.9664 + -5644.9664 = 0.0000
0.0000 + -12.52r2 = 0.00 + -5644.9664
-12.52r2 = 0.00 + -5644.9664

Combine like terms: 0.00 + -5644.9664 = -5644.9664
-12.52r2 = -5644.9664

Divide each side by '-12.52'.
r2 = 450.8759105

Simplifying
r2 = 450.8759105

Take the square root of each side:
r = {-21.233838807, 21.233838807}

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