Known :
d = 8 cm
r = ½ d = ½ × 8 = 4 cm
h = 18 cm
Asked :
V = ...?
Answer :
V = πr²h
= 3,14 × 4² × 18
= 3,14 × 16 × 18
= 904,32 cm³
Hope this is helpful and useful :)