如图在四棱锥p abcd中底面abcd是矩形侧棱pa垂直于底面ef分别是abpc的中点 1求证cd⊥pd 2求证 Template




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tomski如图在四棱锥p abcd中底面abcd是矩形侧棱pa垂直于底面ef分别是abpc的中点 1求证cd⊥pd coloring