Answer:
Step-by-step explanation:
d and r are the diameter and radius, respectively. 
d = 8 units
r = 8/2 = 4 units
area = πr² = 16π square units. 
 
        
             
        
        
        
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Volume of the cone = 1/3π r^2 h
So, we are given that r = 9 and h = 12
plugging in all the known values 
1/3 * (3.14) * 9 * 9 * 12
= 1017.36 cm³
or
≈1017.4 cm³