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由於AB1=B1C,並且該三角行AB1C為等邊三角形,取AC中點N,連接B1N,所以B1N垂直於AC. 並且AM=MC,三角形AMC為等腰三角行,連接MN,MN垂直於AC. 所以AC垂直NMB1.求體積就可以馬上求出來了
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