7234.56=4*3.14*r^2

Solution for 7234.56=4*3.14*r^2 equation:

Simplifying
7234.56 = 4 * 3.14r2

Multiply 4 * 3.14
7234.56 = 12.56r2

Solving
7234.56 = 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.
7234.56 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
7234.56 + -12.56r2 = 0.00

Add '-7234.56' to each side of the equation.
7234.56 + -7234.56 + -12.56r2 = 0.00 + -7234.56

Combine like terms: 7234.56 + -7234.56 = 0.00
0.00 + -12.56r2 = 0.00 + -7234.56
-12.56r2 = 0.00 + -7234.56

Combine like terms: 0.00 + -7234.56 = -7234.56
-12.56r2 = -7234.56

Divide each side by '-12.56'.
r2 = 576

Simplifying
r2 = 576

Take the square root of each side:
r = {-24, 24}