10.5671641791 is the answer.
The answer to it is -3.2 or -3 1/5
The answer is d = 12.99 in. ☺
The Circumference is 40.82 so you use that to get your Diameter.
Quadratic in equality is quadratic function that is compared to another function like: x^2+4x-1<2x-3. the answer for x must comply to both sides.
