27=3.14r^2

Solution for 27=3.14r^2 equation:

Simplifying
27 = 3.14r2

Solving
27 = 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.
27 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
27 + -3.14r2 = 0.00

Add '-27' to each side of the equation.
27 + -27 + -3.14r2 = 0.00 + -27

Combine like terms: 27 + -27 = 0
0 + -3.14r2 = 0.00 + -27
-3.14r2 = 0.00 + -27

Combine like terms: 0.00 + -27 = -27
-3.14r2 = -27

Divide each side by '-3.14'.
r2 = 8.598726115

Simplifying
r2 = 8.598726115

Take the square root of each side:
r = {-2.932358456, 2.932358456}