(2014?揭阳三模)如图,在三棱柱ABC-A1B1C1中,AB⊥AC,顶点A1在底面ABC上的射影恰为点B,且AB=A
(2014?揭阳三模)如图,在三棱柱ABC-A1B1C1中,AB⊥AC,顶点A1在底面ABC上的射影恰为点B,且AB=AC=A1B=2
(2014?揭阳三模)如图,在三棱柱ABC-A
1B
1C
1中,AB⊥AC,顶点A
1在底面ABC上的射影恰为点B,且AB=AC=A
1B=2.
(1)求证:A
1C
1⊥平面AA
1B
1B;
(2)若P为线段B
1C
1的中点,求四棱锥P-AA
1B
1B的体积.