如图,在正三棱柱ABC-A₁B₁C₁中,点D,E,F分别是BC,AC1,BB1的中点.求证:(1)平面AC1⊥平面BCC₁B₁; (2)EF∥平面A₁B₁C₁D₁
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![如图,在正三棱柱ABC-A₁B₁C₁中,点D,E,F分别是BC,AC1,BB1的中点.求证:(1)平面AC1⊥平面BCC₁B₁; (2)EF∥平面A₁B₁C₁D₁](/uploads/image/z/12974667-51-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%AD%A3%E4%B8%89%E6%A3%B1%E6%9F%B1ABC-A%26%238321%3BB%26%238321%3BC%26%238321%3B%E4%B8%AD%2C%E7%82%B9D%2CE%2CF%E5%88%86%E5%88%AB%E6%98%AFBC%2CAC1%2CBB1%E7%9A%84%E4%B8%AD%E7%82%B9.%E6%B1%82%E8%AF%81%EF%BC%9A%EF%BC%881%EF%BC%89%E5%B9%B3%E9%9D%A2AC1%E2%8A%A5%E5%B9%B3%E9%9D%A2BCC%26%238321%3BB%26%238321%3B%3B+++++++++++++++%282%29EF%E2%88%A5%E5%B9%B3%E9%9D%A2A%26%238321%3BB%26%238321%3BC%26%238321%3BD%26%238321%3B)
如图,在正三棱柱ABC-A₁B₁C₁中,点D,E,F分别是BC,AC1,BB1的中点.求证:(1)平面AC1⊥平面BCC₁B₁; (2)EF∥平面A₁B₁C₁D₁
如图,在正三棱柱ABC-A₁B₁C₁中,点D,E,F分别是BC,AC1,BB1的中点.
求证:(1)平面AC1⊥平面BCC₁B₁;
(2)EF∥平面A₁B₁C₁D₁
如图,在正三棱柱ABC-A₁B₁C₁中,点D,E,F分别是BC,AC1,BB1的中点.求证:(1)平面AC1⊥平面BCC₁B₁; (2)EF∥平面A₁B₁C₁D₁
正三棱柱ABC-A1B1C1,BB1⊥平面ABC,AD在平面ABC内,AD⊥BB1
正三棱柱ABC-A1B1C1,△ABC为正三角形,D是BC的中点,AD⊥BC
BB1,BC在平面BCC1B1内
AD⊥平面BCC1B1
AD在平面AC1D内,
平面AC1D垂直平面BCC1BI