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在棱长为4的正方体ABCD-A1B1C1D1中.O是正方形A1B1C1D1的中心.点P在棱
在棱长为4的正方体ABCD-A1B1C1D1中.O是正方形A1B1C1D1的中心.点P在棱
发布时间:2021-02-20 12:10:16
在棱长为4的正方体ABCD-A1B1C1D1中,O是正方形A1B1C1D1的中心.点P在棱CC1上,且CC1=4CP.
(1)设O点在平面D1AP上的射影是H,求证:D1H⊥AP;
(2)求V锥P-ABD1.
网友回答
答案:
分析:
(1)连接A1C1,利用O点在平面D1AP上的射影是H,通过证明AP⊥面D1OH,然后证明D1H⊥AP;
(2)直接通过转化利用V锥P-ABD1=VQ-ABD1=VB-D1QA,求解V锥P-ABD1.
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