6385.8682=3.14*r^2

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Solution for 6385.8682=3.14*r^2 equation: 


Simplifying
6385.8682 = 3.14r2

Solving
6385.8682 = 3.14r2

Solving for variable 'r'.

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

Add '-3.14r2' to each side of the equation.
6385.8682 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
6385.8682 + -3.14r2 = 0.00

Add '-6385.8682' to each side of the equation.
6385.8682 + -6385.8682 + -3.14r2 = 0.00 + -6385.8682

Combine like terms: 6385.8682 + -6385.8682 = 0.0000
0.0000 + -3.14r2 = 0.00 + -6385.8682
-3.14r2 = 0.00 + -6385.8682

Combine like terms: 0.00 + -6385.8682 = -6385.8682
-3.14r2 = -6385.8682

Divide each side by '-3.14'.
r2 = 2033.715987

Simplifying
r2 = 2033.715987

Take the square root of each side:
r = {-45.096740315, 45.096740315}

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