200.96=3.14*r^2

Solution for 200.96=3.14*r^2 equation:

Simplifying
200.96 = 3.14r2

Solving
200.96 = 3.14r2

Solving for variable 'r'.

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

Add '-3.14r2' to each side of the equation.
200.96 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
200.96 + -3.14r2 = 0.00

Add '-200.96' to each side of the equation.
200.96 + -200.96 + -3.14r2 = 0.00 + -200.96

Combine like terms: 200.96 + -200.96 = 0.00
0.00 + -3.14r2 = 0.00 + -200.96
-3.14r2 = 0.00 + -200.96

Combine like terms: 0.00 + -200.96 = -200.96
-3.14r2 = -200.96

Divide each side by '-3.14'.
r2 = 64

Simplifying
r2 = 64

Take the square root of each side:
r = {-8, 8}