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d= 40cm, r= 20cm
t= 1,5dm = 15cm
dit:
V=....?
penye:
V= pi × r^2 × t
= 3,14 × 20^2 × 15
= 3,14 × 400 × 15
= 1256 × 15
= 18.840cm^3
= 18.840ml
= 3,14 x 20 x 20 x 15
= 18.840 ml