6=3.14*r^2

Solution for 6=3.14*r^2 equation:

Simplifying
6 = 3.14r2

Solving
6 = 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.
6 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
6 + -3.14r2 = 0.00

Add '-6' to each side of the equation.
6 + -6 + -3.14r2 = 0.00 + -6

Combine like terms: 6 + -6 = 0
0 + -3.14r2 = 0.00 + -6
-3.14r2 = 0.00 + -6

Combine like terms: 0.00 + -6 = -6
-3.14r2 = -6

Divide each side by '-3.14'.
r2 = 1.910828025

Simplifying
r2 = 1.910828025

Take the square root of each side:
r = {-1.382327033, 1.382327033}