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設A=(x1,y1,z1),B=(x2,y2,z2),C=(x3,y3,z3) AB=(x2-x1,y2-y1,z2-z1),AC=(x3-x1,y3-y1,z3-z1) 三角形面積:S=|AB×AC|/2(×為叉積)
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