72165.2384=4*3.14*r^2

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Solution for 72165.2384=4*3.14*r^2 equation: 


Simplifying
72165.2384 = 4 * 3.14r2

Multiply 4 * 3.14
72165.2384 = 12.56r2

Solving
72165.2384 = 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.
72165.2384 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
72165.2384 + -12.56r2 = 0.00

Add '-72165.2384' to each side of the equation.
72165.2384 + -72165.2384 + -12.56r2 = 0.00 + -72165.2384

Combine like terms: 72165.2384 + -72165.2384 = 0.0000
0.0000 + -12.56r2 = 0.00 + -72165.2384
-12.56r2 = 0.00 + -72165.2384

Combine like terms: 0.00 + -72165.2384 = -72165.2384
-12.56r2 = -72165.2384

Divide each side by '-12.56'.
r2 = 5745.64

Simplifying
r2 = 5745.64

Take the square root of each side:
r = {-75.8, 75.8}

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