Answer:
785.398 ft
Step-by-step explanation:
Circumfrence = pi * diameter
Differentiating once, we have

Differentiating again,


as needed.
Answer:
I think the answer is 432 cubic inches( in^3). Answer is the first option.
Tan -1 = 13/21
31.7
32degrees
6 7/12 I hope this helps ya out