6.28=2r^2

Solution for 6.28=2r^2 equation:

Simplifying
6.28 = 2r2

Solving
6.28 = 2r2

Solving for variable 'r'.

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

Add '-2r2' to each side of the equation.
6.28 + -2r2 = 2r2 + -2r2

Combine like terms: 2r2 + -2r2 = 0
6.28 + -2r2 = 0

Add '-6.28' to each side of the equation.
6.28 + -6.28 + -2r2 = 0 + -6.28

Combine like terms: 6.28 + -6.28 = 0.00
0.00 + -2r2 = 0 + -6.28
-2r2 = 0 + -6.28

Combine like terms: 0 + -6.28 = -6.28
-2r2 = -6.28

Divide each side by '-2'.
r2 = 3.14

Simplifying
r2 = 3.14

Take the square root of each side:
r = {-1.772004515, 1.772004515}