22=3.14r^2

Solution for 22=3.14r^2 equation:

Simplifying
22 = 3.14r2

Solving
22 = 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.
22 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
22 + -3.14r2 = 0.00

Add '-22' to each side of the equation.
22 + -22 + -3.14r2 = 0.00 + -22

Combine like terms: 22 + -22 = 0
0 + -3.14r2 = 0.00 + -22
-3.14r2 = 0.00 + -22

Combine like terms: 0.00 + -22 = -22
-3.14r2 = -22

Divide each side by '-3.14'.
r2 = 7.006369427

Simplifying
r2 = 7.006369427

Take the square root of each side:
r = {-2.646954746, 2.646954746}