如图,在几何体P-ABCD中,ABCD是直角梯形,AD平行BC如图,在几何体P-ABCD中,ABCD是直角梯形,AD平行BC,∠DAB=90°,PA⊥底面ABCD.且PA=AB=BC=(1/2)AD=1,CD=根号2,M是PD中点.1求证CD⊥面PAC2求直线CM与面MAD所成角大小3
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![如图,在几何体P-ABCD中,ABCD是直角梯形,AD平行BC如图,在几何体P-ABCD中,ABCD是直角梯形,AD平行BC,∠DAB=90°,PA⊥底面ABCD.且PA=AB=BC=(1/2)AD=1,CD=根号2,M是PD中点.1求证CD⊥面PAC2求直线CM与面MAD所成角大小3](/uploads/image/z/11965199-23-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%87%A0%E4%BD%95%E4%BD%93P-ABCD%E4%B8%AD%2CABCD%E6%98%AF%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2%2CAD%E5%B9%B3%E8%A1%8CBC%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%87%A0%E4%BD%95%E4%BD%93P-ABCD%E4%B8%AD%2CABCD%E6%98%AF%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2%2CAD%E5%B9%B3%E8%A1%8CBC%2C%E2%88%A0DAB%3D90%C2%B0%2CPA%E2%8A%A5%E5%BA%95%E9%9D%A2ABCD.%E4%B8%94PA%3DAB%3DBC%3D%281%2F2%29AD%3D1%2CCD%3D%E6%A0%B9%E5%8F%B72%2CM%E6%98%AFPD%E4%B8%AD%E7%82%B9.1%E6%B1%82%E8%AF%81CD%E2%8A%A5%E9%9D%A2PAC2%E6%B1%82%E7%9B%B4%E7%BA%BFCM%E4%B8%8E%E9%9D%A2MAD%E6%89%80%E6%88%90%E8%A7%92%E5%A4%A7%E5%B0%8F3)
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