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Chủ đề: Đờng thẳng và mặt phẳng trong không gian.
Quan hệ song song
Tiết 13-14: Hai đờng thẳng chéo nhau,
hai đờng thẳng song song. Hình tứ diện.
!,*0>4
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Baứi 10 : (SGK trang 54)
P
0
M
A
D
B
C
S
R
N
Q
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b). Goùi O= ACBN
=H
>4?@ !D Bài 9: (SGK trang 54)
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c). Gọi I = SO ∩BM.
Ta có I = BM∩(SAC)
d. Gọi R=AB∩CD
P=MR∩SC, ta có P= SC∩(ABM)
Vậy PM=(CSD) ∩(ABM).
Bài 9: (SGK trang 54)
d
A
E
C'
D
C
B
S
M
F
a). Gọi M=AE∩DC
Ta có M=DC∩(C’AE)
b). Gọi F=MC’∩SD. Thiết diện cần tìm
là tứ giác AEC’F
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