如图,在四棱锥S-ABCD中,SB⊥底面ABCD,底面ABCD为矩形,点E为SB的中点. (Ⅰ)求证:AB⊥SC; (Ⅱ)求证:SD∥平面AEC.

问题描述:

如图,在四棱锥S-ABCD中,SB⊥底面ABCD,底面ABCD为矩形,点E为SB的中点.

(Ⅰ)求证:AB⊥SC;
(Ⅱ)求证:SD∥平面AEC.

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