如图正四棱锥s Abcd 的底面是边长为a正方形o为底面对角线交点侧棱长是底面边长的2倍p为侧棱sd上的点.Ⅰ求证ac⊥sd Template




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tomski如图正四棱锥s abcd 的底面是边长为a正方形o为底面对角线交点侧棱长是底面边长的2倍p为侧棱sd上的点.Ⅰ求证ac⊥sd coloring