解答题-证明题 适中0.65 引用1 组卷438
如图,已知四棱锥S-ABCD,底面四边形ABCD为平行四边形,
,
,
.若点G在棱AD上,满足
,点E在棱SB上,满足
,侧面SBC⊥底面ABCD.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2972308506329088/2973463259791360/STEM/3a3a5abb-045b-49b9-9557-472d51cbbdd5.png?resizew=167)
(1)求证:CE⊥平面SBG;
(2)若SC⊥底面ABCD且
,求二面角S-GB-C的余弦值.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2972308506329088/2973463259791360/STEM/3a3a5abb-045b-49b9-9557-472d51cbbdd5.png?resizew=167)
(1)求证:CE⊥平面SBG;
(2)若SC⊥底面ABCD且
2022·福建龙岩·模拟预测
类题推荐
组卷网是一个信息分享及获取的平台,不能确保所有知识产权权属清晰,如您发现相关试题侵犯您的合法权益,请联系组卷网