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半圓柱的體積比較好求,只要算出整個圓柱的體積再除以2就是半圓柱的體積 半圓柱的表面積比較複雜,要算出整個圓柱的表面積再除以2,然後加上長方形截面的面積就是半圓柱的表面積,長方形截面的面積=圓柱的直徑*圓柱的高
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