32.1536=3.14*r^2

Solution for 32.1536=3.14*r^2 equation:

Simplifying
32.1536 = 3.14r2

Solving
32.1536 = 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.
32.1536 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
32.1536 + -3.14r2 = 0.00

Add '-32.1536' to each side of the equation.
32.1536 + -32.1536 + -3.14r2 = 0.00 + -32.1536

Combine like terms: 32.1536 + -32.1536 = 0.0000
0.0000 + -3.14r2 = 0.00 + -32.1536
-3.14r2 = 0.00 + -32.1536

Combine like terms: 0.00 + -32.1536 = -32.1536
-3.14r2 = -32.1536

Divide each side by '-3.14'.
r2 = 10.24

Simplifying
r2 = 10.24

Take the square root of each side:
r = {-3.2, 3.2}