3890.5856=4*3.14*r^2

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Solution for 3890.5856=4*3.14*r^2 equation: 


Simplifying
3890.5856 = 4 * 3.14r2

Multiply 4 * 3.14
3890.5856 = 12.56r2

Solving
3890.5856 = 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.
3890.5856 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
3890.5856 + -12.56r2 = 0.00

Add '-3890.5856' to each side of the equation.
3890.5856 + -3890.5856 + -12.56r2 = 0.00 + -3890.5856

Combine like terms: 3890.5856 + -3890.5856 = 0.0000
0.0000 + -12.56r2 = 0.00 + -3890.5856
-12.56r2 = 0.00 + -3890.5856

Combine like terms: 0.00 + -3890.5856 = -3890.5856
-12.56r2 = -3890.5856

Divide each side by '-12.56'.
r2 = 309.76

Simplifying
r2 = 309.76

Take the square root of each side:
r = {-17.6, 17.6}

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