144=3.14r^2(9)

Solution for 144=3.14r^2(9) equation:

Simplifying
144 = 3.14r2(9)

Reorder the terms for easier multiplication:
144 = 3.14 * 9r2

Multiply 3.14 * 9
144 = 28.26r2

Solving
144 = 28.26r2

Solving for variable 'r'.

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

Add '-28.26r2' to each side of the equation.
144 + -28.26r2 = 28.26r2 + -28.26r2

Combine like terms: 28.26r2 + -28.26r2 = 0.00
144 + -28.26r2 = 0.00

Add '-144' to each side of the equation.
144 + -144 + -28.26r2 = 0.00 + -144

Combine like terms: 144 + -144 = 0
0 + -28.26r2 = 0.00 + -144
-28.26r2 = 0.00 + -144

Combine like terms: 0.00 + -144 = -144
-28.26r2 = -144

Divide each side by '-28.26'.
r2 = 5.095541401

Simplifying
r2 = 5.095541401

Take the square root of each side:
r = {-2.257330592, 2.257330592}