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①若繞著長旋轉一周, 體積=5*π*4²;=80π, ②若繞著寬旋轉一周, 體積=4*π*5²;=100π, 繞寬轉一周的體積大. 啟示:若要得到圓柱體的體積大,則應長方形繞它的寬所在直線旋轉一周.
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