100.48=3.14*r^2

Solution for 100.48=3.14*r^2 equation:

Simplifying
100.48 = 3.14r2

Solving
100.48 = 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.
100.48 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
100.48 + -3.14r2 = 0.00

Add '-100.48' to each side of the equation.
100.48 + -100.48 + -3.14r2 = 0.00 + -100.48

Combine like terms: 100.48 + -100.48 = 0.00
0.00 + -3.14r2 = 0.00 + -100.48
-3.14r2 = 0.00 + -100.48

Combine like terms: 0.00 + -100.48 = -100.48
-3.14r2 = -100.48

Divide each side by '-3.14'.
r2 = 32

Simplifying
r2 = 32

Take the square root of each side:
r = {-5.656854249, 5.656854249}