63.55=3.141592653r^2

Solution for 63.55=3.141592653r^2 equation:

Simplifying
63.55 = 3.141592653r2

Solving
63.55 = 3.141592653r2

Solving for variable 'r'.

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

Add '-3.141592653r2' to each side of the equation.
63.55 + -3.141592653r2 = 3.141592653r2 + -3.141592653r2

Combine like terms: 3.141592653r2 + -3.141592653r2 = 0.000000000
63.55 + -3.141592653r2 = 0.000000000

Add '-63.55' to each side of the equation.
63.55 + -63.55 + -3.141592653r2 = 0.000000000 + -63.55

Combine like terms: 63.55 + -63.55 = 0.00
0.00 + -3.141592653r2 = 0.000000000 + -63.55
-3.141592653r2 = 0.000000000 + -63.55

Combine like terms: 0.000000000 + -63.55 = -63.55
-3.141592653r2 = -63.55

Divide each side by '-3.141592653'.
r2 = 20.22859327

Simplifying
r2 = 20.22859327

Take the square root of each side:
r = {-4.497620846, 4.497620846}