500=3.1416*r^2

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Solution for 500=3.1416*r^2 equation: 


Simplifying
500 = 3.1416r2

Solving
500 = 3.1416r2

Solving for variable 'r'.

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

Add '-3.1416r2' to each side of the equation.
500 + -3.1416r2 = 3.1416r2 + -3.1416r2

Combine like terms: 3.1416r2 + -3.1416r2 = 0.0000
500 + -3.1416r2 = 0.0000

Add '-500' to each side of the equation.
500 + -500 + -3.1416r2 = 0.0000 + -500

Combine like terms: 500 + -500 = 0
0 + -3.1416r2 = 0.0000 + -500
-3.1416r2 = 0.0000 + -500

Combine like terms: 0.0000 + -500 = -500
-3.1416r2 = -500

Divide each side by '-3.1416'.
r2 = 159.1545709

Simplifying
r2 = 159.1545709

Take the square root of each side:
r = {-12.615647859, 12.615647859}

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