Answer:
I believe a pyramid has A. 5 faces
s = 1800°
To find the sum of interior angles in a polygon you can use the following equation

If this helped you a Brainliest would be appreciated!
243 + 62-28 = n
243 + 34 = n
277 = n
n= 277
Well, if it is increasing at a fixed rate of 2 mm/s, then the volume would still be increasing at a rate of 2 mm/s when the diameter is 80 mm, if I understand your question correctly.