已知三棱锥S-ABC,SC\\面EFGH,AB\\面EFGH,求证EFGH为平行四边形(求证平行于三棱锥的两条相对棱的平面截三棱锥所得截面是平行四边形)
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![已知三棱锥S-ABC,SC\\面EFGH,AB\\面EFGH,求证EFGH为平行四边形(求证平行于三棱锥的两条相对棱的平面截三棱锥所得截面是平行四边形)](/uploads/image/z/11454656-32-6.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E6%A3%B1%E9%94%A5S-ABC%2CSC%5C%5C%E9%9D%A2EFGH%2CAB%5C%5C%E9%9D%A2EFGH%2C%E6%B1%82%E8%AF%81EFGH%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%EF%BC%88%E6%B1%82%E8%AF%81%E5%B9%B3%E8%A1%8C%E4%BA%8E%E4%B8%89%E6%A3%B1%E9%94%A5%E7%9A%84%E4%B8%A4%E6%9D%A1%E7%9B%B8%E5%AF%B9%E6%A3%B1%E7%9A%84%E5%B9%B3%E9%9D%A2%E6%88%AA%E4%B8%89%E6%A3%B1%E9%94%A5%E6%89%80%E5%BE%97%E6%88%AA%E9%9D%A2%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%29)
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