500=4*3.14*r^2

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Solution for 500=4*3.14*r^2 equation: 


Simplifying
500 = 4 * 3.14r2

Multiply 4 * 3.14
500 = 12.56r2

Solving
500 = 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.
500 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
500 + -12.56r2 = 0.00

Add '-500' to each side of the equation.
500 + -500 + -12.56r2 = 0.00 + -500

Combine like terms: 500 + -500 = 0
0 + -12.56r2 = 0.00 + -500
-12.56r2 = 0.00 + -500

Combine like terms: 0.00 + -500 = -500
-12.56r2 = -500

Divide each side by '-12.56'.
r2 = 39.8089172

Simplifying
r2 = 39.8089172

Take the square root of each side:
r = {-6.309430814, 6.309430814}

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