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設圓柱體的體積為V1,圓錐體的體積為V2,V1=V2 V1=π×r×r×h(1)V2=(∏/3)×R×R×h(2)(1)式等於(2)式π×r×r×h=(∏/3)×R×R×h得:R×R=3r×r已知圓柱體周長L=2∏r,r=12.5…
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