6358.5=4*3.14*r^2

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Solution for 6358.5=4*3.14*r^2 equation: 


Simplifying
6358.5 = 4 * 3.14r2

Multiply 4 * 3.14
6358.5 = 12.56r2

Solving
6358.5 = 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.
6358.5 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
6358.5 + -12.56r2 = 0.00

Add '-6358.5' to each side of the equation.
6358.5 + -6358.5 + -12.56r2 = 0.00 + -6358.5

Combine like terms: 6358.5 + -6358.5 = 0.0
0.0 + -12.56r2 = 0.00 + -6358.5
-12.56r2 = 0.00 + -6358.5

Combine like terms: 0.00 + -6358.5 = -6358.5
-12.56r2 = -6358.5

Divide each side by '-12.56'.
r2 = 506.25

Simplifying
r2 = 506.25

Take the square root of each side:
r = {-22.5, 22.5}

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