2826=31.4*r^2

Solution for 2826=31.4*r^2 equation:

Simplifying
2826 = 31.4r2

Solving
2826 = 31.4r2

Solving for variable 'r'.

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

Add '-31.4r2' to each side of the equation.
2826 + -31.4r2 = 31.4r2 + -31.4r2

Combine like terms: 31.4r2 + -31.4r2 = 0.0
2826 + -31.4r2 = 0.0

Add '-2826' to each side of the equation.
2826 + -2826 + -31.4r2 = 0.0 + -2826

Combine like terms: 2826 + -2826 = 0
0 + -31.4r2 = 0.0 + -2826
-31.4r2 = 0.0 + -2826

Combine like terms: 0.0 + -2826 = -2826
-31.4r2 = -2826

Divide each side by '-31.4'.
r2 = 90

Simplifying
r2 = 90

Take the square root of each side:
r = {-9.486832981, 9.486832981}