26=3.14*r^2

Solution for 26=3.14*r^2 equation:

Simplifying
26 = 3.14r2

Solving
26 = 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.
26 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
26 + -3.14r2 = 0.00

Add '-26' to each side of the equation.
26 + -26 + -3.14r2 = 0.00 + -26

Combine like terms: 26 + -26 = 0
0 + -3.14r2 = 0.00 + -26
-3.14r2 = 0.00 + -26

Combine like terms: 0.00 + -26 = -26
-3.14r2 = -26

Divide each side by '-3.14'.
r2 = 8.280254777

Simplifying
r2 = 8.280254777

Take the square root of each side:
r = {-2.877543184, 2.877543184}