The answer is 0. While the answer for n is approximately 2.384503, there are no EXTRANEOUS solutions. Again, the answer is a.) 0
They are not proportional
I used 3.14 for pi to solve easier.
6. 6.28
7. 21.98
8. 94.2
11 units long. When something is rotated it does not change its shape/length, only when it is dilated.