(本小题满分12分)如图,四棱锥P-ABCD中,PD⊥平面ABCD,PD="DC=BC=1," AB="2," AB∥DC,∠BCD=900
(1)求证:PC⊥BC
(2)求点A到平面PBC的距离
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(本小题满分12分)如图,四棱锥P-ABCD中,PD⊥平面ABCD,PD="DC=BC=1," AB="2," AB∥DC,∠BCD=900
(1)求证:PC⊥BC
(2)求点A到平面PBC的距离