13.已知正四棱柱ABCD−A1B1C1D1ABCD-A_{1}B_{1}C_{1}D_{1}ABCD−A1B1C1D1中,AB=2AB=2AB=2,AA1=3AA_{1}=3AA1=3.(1)求正四棱柱ABCD−A1B1C1D1ABCD-A_{1}B_{1}C_{1}D_{1}ABCD−A1B1C1D1的表面积;(2)求证:平面A1ACC1⊥A_{1}ACC_{1}\botA1ACC1⊥平面A1BDA_{1}BDA1BD.