3=3.14r^2

Solution for 3=3.14r^2 equation:

Simplifying
3 = 3.14r2

Solving
3 = 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.
3 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
3 + -3.14r2 = 0.00

Add '-3' to each side of the equation.
3 + -3 + -3.14r2 = 0.00 + -3

Combine like terms: 3 + -3 = 0
0 + -3.14r2 = 0.00 + -3
-3.14r2 = 0.00 + -3

Combine like terms: 0.00 + -3 = -3
-3.14r2 = -3

Divide each side by '-3.14'.
r2 = 0.9554140127

Simplifying
r2 = 0.9554140127

Take the square root of each side:
r = {-0.977452819, 0.977452819}