59=3.1459*r^2

Solution for 59=3.1459*r^2 equation:

Simplifying
59 = 3.1459r2

Solving
59 = 3.1459r2

Solving for variable 'r'.

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

Add '-3.1459r2' to each side of the equation.
59 + -3.1459r2 = 3.1459r2 + -3.1459r2

Combine like terms: 3.1459r2 + -3.1459r2 = 0.0000
59 + -3.1459r2 = 0.0000

Add '-59' to each side of the equation.
59 + -59 + -3.1459r2 = 0.0000 + -59

Combine like terms: 59 + -59 = 0
0 + -3.1459r2 = 0.0000 + -59
-3.1459r2 = 0.0000 + -59

Combine like terms: 0.0000 + -59 = -59
-3.1459r2 = -59

Divide each side by '-3.1459'.
r2 = 18.75456944

Simplifying
r2 = 18.75456944

Take the square root of each side:
r = {-4.33065462, 4.33065462}