题目内容

(本小题满分12分)
如图,在四棱锥P—ABCD中,底面ABCD是矩形,已知AB = 3,AD = 2,PA = 2,
(1)   证明:AD⊥平面PAB
(2)   求异面直线PCAD所成的角的大小;
(3)   求二面角P—BD—A的大小.
(1)略(2)(3)略
                 
(1)          AD⊥面PAB···································· 4分
     
(2) ADBCPCB(或其补角)为异面直线PCAD所成角
  
·············································· 8分
(3) 作PMABMMOBDO


      MOBD

 
PMAB
PMPAB
 

 
            
          为二面角P—BD—A的平面角························· 10分

          12分
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