13.6900004=r^2

Solution for 13.6900004=r^2 equation:

Simplifying
13.6900004 = r2

Solving
13.6900004 = r2

Solving for variable 'r'.

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

Add '-1r2' to each side of the equation.
13.6900004 + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
13.6900004 + -1r2 = 0

Add '-13.6900004' to each side of the equation.
13.6900004 + -13.6900004 + -1r2 = 0 + -13.6900004

Combine like terms: 13.6900004 + -13.6900004 = 0.0000000
0.0000000 + -1r2 = 0 + -13.6900004
-1r2 = 0 + -13.6900004

Combine like terms: 0 + -13.6900004 = -13.6900004
-1r2 = -13.6900004

Divide each side by '-1'.
r2 = 13.6900004

Simplifying
r2 = 13.6900004

Take the square root of each side:
r = {-3.700000054, 3.700000054}