若三棱锥的顶点在底面上的射影恰好是底面三角形的垂心则这个棱锥 A三条侧棱的长一定相等 b三条侧棱一定两两相互垂直 C三条侧棱分别 Template




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tomski若三棱锥的顶点在底面上的射影恰好是底面三角形的垂心则这个棱锥 a三条侧棱的长一定相等 b三条侧棱一定两两相互垂直 coloring