Answer:
6π cm³ 
 
Step-by-step explanation: 
 
 
V = Ah ( A is the base area and h the height ), then 
 
3πh = 18π ( divide both sides by 3π ) 
 
h = = 6 
 
Then the height of the smaller cylinder = 6 - 3 = 3 cm 
 
V = 3π × 3 = 9π cm³ ← volume of smaller can 
 
Explanation: