Please Help!!!!

The formula volume equals one-third times base area times height can be used to find the volume of each of the following figures, except which of the following?
Possible Answers:

A. rectangular base pyramid

B. hexagonal base pyramid

C. cone

D. cylinder

Question

Please Help!!!!

The formula volume equals one-third times base area times height can be used to find the volume of each of the following figures, except which of the following?
Possible Answers:
		
A. rectangular base pyramid
		
B. hexagonal base pyramid
		
C. cone
		
D. cylinder

anonymous · Answer

The key is that the above formula can only be used for pyramids, no matter the nature of the base. Obviously both A and B are pyramids, and we can think of C as a pyramid with a circular base. 
However, we cannot use the formula for D, a cylinder (nothing like a pyramid). Incidentally the formula is just base area times height for cylinders.