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直角三角形ABC中∠C=90°.PA⊥平面ABC.AM⊥PB于M.AN⊥PC于N.求证:①
直角三角形ABC中∠C=90°.PA⊥平面ABC.AM⊥PB于M.AN⊥PC于N.求证:①
发布时间:2021-02-20 14:24:49
20、直角三角形ABC中∠C=90°,PA⊥平面ABC,AM⊥PB于M,AN⊥PC于N.
求证:①BC⊥平面PAC;
②PB⊥平面AMN.
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答案:
分析:
①由已知中直角三角形ABC中∠C=90°,PA⊥平面ABC,我们易得到AC⊥BC,PA⊥BC,由线面垂直的判定定理,即可得到BC⊥平面PAC;
②由①的结论,结合线面垂直的性质,可得BC⊥AN,由AM⊥PB于M,AN⊥PC于N,我们由线面垂直的判定定理,即可得到PB⊥平面AMN.
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