D/2= 14/2=7r
V= 1/4×π×r×r×t
= 1/4×22/7×7×7×20
=22×1×5
=110cm³
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D/2= 14/2=7r
V= 1/4×π×r×r×t
= 1/4×22/7×7×7×20
=22×1×5
=110cm³