4298.66=4*3.14*r^2

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Solution for 4298.66=4*3.14*r^2 equation: 


Simplifying
4298.66 = 4 * 3.14r2

Multiply 4 * 3.14
4298.66 = 12.56r2

Solving
4298.66 = 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.
4298.66 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
4298.66 + -12.56r2 = 0.00

Add '-4298.66' to each side of the equation.
4298.66 + -4298.66 + -12.56r2 = 0.00 + -4298.66

Combine like terms: 4298.66 + -4298.66 = 0.00
0.00 + -12.56r2 = 0.00 + -4298.66
-12.56r2 = 0.00 + -4298.66

Combine like terms: 0.00 + -4298.66 = -4298.66
-12.56r2 = -4298.66

Divide each side by '-12.56'.
r2 = 342.25

Simplifying
r2 = 342.25

Take the square root of each side:
r = {-18.5, 18.5}

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