82.0670=3.14*r^2

Solution for 82.0670=3.14*r^2 equation:

Simplifying
82.0670 = 3.14r2

Solving
82.0670 = 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.
82.0670 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
82.0670 + -3.14r2 = 0.00

Add '-82.0670' to each side of the equation.
82.0670 + -82.0670 + -3.14r2 = 0.00 + -82.0670

Combine like terms: 82.0670 + -82.0670 = 0.0000
0.0000 + -3.14r2 = 0.00 + -82.0670
-3.14r2 = 0.00 + -82.0670

Combine like terms: 0.00 + -82.0670 = -82.067
-3.14r2 = -82.067

Divide each side by '-3.14'.
r2 = 26.13598726

Simplifying
r2 = 26.13598726

Take the square root of each side:
r = {-5.112336771, 5.112336771}