109.3040=3.14*r^2

Solution for 109.3040=3.14*r^2 equation:

Simplifying
109.3040 = 3.14r2

Solving
109.3040 = 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.
109.3040 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
109.3040 + -3.14r2 = 0.00

Add '-109.3040' to each side of the equation.
109.3040 + -109.3040 + -3.14r2 = 0.00 + -109.3040

Combine like terms: 109.3040 + -109.3040 = 0.0000
0.0000 + -3.14r2 = 0.00 + -109.3040
-3.14r2 = 0.00 + -109.3040

Combine like terms: 0.00 + -109.3040 = -109.304
-3.14r2 = -109.304

Divide each side by '-3.14'.
r2 = 34.81019108

Simplifying
r2 = 34.81019108

Take the square root of each side:
r = {-5.900016193, 5.900016193}