32*3.14=3.14*r^2*8

Solution for 32*3.14=3.14*r^2*8 equation:

Simplifying
32 * 3.14 = 3.14r2 * 8

Multiply 32 * 3.14
100.48 = 3.14r2 * 8

Reorder the terms for easier multiplication:
100.48 = 3.14 * 8r2

Multiply 3.14 * 8
100.48 = 25.12r2

Solving
100.48 = 25.12r2

Solving for variable 'r'.

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

Add '-25.12r2' to each side of the equation.
100.48 + -25.12r2 = 25.12r2 + -25.12r2

Combine like terms: 25.12r2 + -25.12r2 = 0.00
100.48 + -25.12r2 = 0.00

Add '-100.48' to each side of the equation.
100.48 + -100.48 + -25.12r2 = 0.00 + -100.48

Combine like terms: 100.48 + -100.48 = 0.00
0.00 + -25.12r2 = 0.00 + -100.48
-25.12r2 = 0.00 + -100.48

Combine like terms: 0.00 + -100.48 = -100.48
-25.12r2 = -100.48

Divide each side by '-25.12'.
r2 = 4

Simplifying
r2 = 4

Take the square root of each side:
r = {-2, 2}