Short Answer: 1
Remark
You could do this by comparing volumes through a proportion and that is likely the quickest way to get an answer. But it is also difficult to understand so I will do this by comparing volumes.
Step one
Find the volume of the small cone
Givens
r = 1 foot
h = 2 feet
pi = 3.14
Formula
V = 1/3 pi r^2 h
Sub and solve
V = 1/3 3.14 1^2 * 2
V = 2.09333
Step Two
Find the volume of the Large Cone
Givens
r = d/2 = 2/2 = 1 foot
h = 2 feet.
We can stop right here. The cones are exactly the same volume.
Answer: 1