(1)45°,因为,B1C1与BC平行,BC与AC成45°
(2)直三棱柱,所以AA1与平面ABC垂直,直线A1C与平面ABC所成角为45度,即为角A1CA=45°,所以A1A=AC=根号2,所以三棱锥A1—ABC的体积=1/3*AB*BC/2*A1A=根号2/6
(1)45°,因为,B1C1与BC平行,BC与AC成45°
(2)直三棱柱,所以AA1与平面ABC垂直,直线A1C与平面ABC所成角为45度,即为角A1CA=45°,所以A1A=AC=根号2,所以三棱锥A1—ABC的体积=1/3*AB*BC/2*A1A=根号2/6