爱上海后花园

18.直四棱柱abcd-a1b1c1d1中,底面是直角梯形,设∠bad=∠abc=900,bc=2,ad=818.直四棱柱ABCD-A1B1C1D1中,底面是直角梯形,设∠BAD=∠ABC=900,BC=2,AD=8,异面直线AC1与A1D互相垂直.(1)直线A1D与平面AC1B关系如何?(2)求直柱棱柱侧棱AA 1的长;(3)已知AB=4,求A1D与平面ADC 1B 1所成角

1AC1A1DBAD=ABC=90BC1AC1A1DAC1BC1AC1BA1DAC1BA1DAC1B...

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