300=3.14r^2

Solution for 300=3.14r^2 equation:

Simplifying
300 = 3.14r2

Solving
300 = 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.
300 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
300 + -3.14r2 = 0.00

Add '-300' to each side of the equation.
300 + -300 + -3.14r2 = 0.00 + -300

Combine like terms: 300 + -300 = 0
0 + -3.14r2 = 0.00 + -300
-3.14r2 = 0.00 + -300

Combine like terms: 0.00 + -300 = -300
-3.14r2 = -300

Divide each side by '-3.14'.
r2 = 95.54140127

Simplifying
r2 = 95.54140127

Take the square root of each side:
r = {-9.774528187, 9.774528187}