55.3390=3.14r^2

Solution for 55.3390=3.14r^2 equation:

Simplifying
55.3390 = 3.14r2

Solving
55.3390 = 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.
55.3390 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
55.3390 + -3.14r2 = 0.00

Add '-55.3390' to each side of the equation.
55.3390 + -55.3390 + -3.14r2 = 0.00 + -55.3390

Combine like terms: 55.3390 + -55.3390 = 0.0000
0.0000 + -3.14r2 = 0.00 + -55.3390
-3.14r2 = 0.00 + -55.3390

Combine like terms: 0.00 + -55.3390 = -55.339
-3.14r2 = -55.339

Divide each side by '-3.14'.
r2 = 17.62388535

Simplifying
r2 = 17.62388535

Take the square root of each side:
r = {-4.198081151, 4.198081151}