hai duong thang song song.pdf
TRANSCRIPT
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SONG SONG
3 1.
4
5
6
8
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c
a b
th
(0 )2
2a b.
a
b
a'
b'
O
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VD1:
S
A
B C
DF
M
N
E
I J
(a)
E SI, F SJ v:
SE SF 2EF//IJ;
SI SJ 3
(b)
Ta c: MN // AB // CD
MN (ABF) (SCD)
AB (ABF), CD (SCD)
AB // CD
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hnh chp.
VD2:
(a) Tm (SAB) (SCD)
Ta c:
S (SAB) (SCD)
AB (SAB), CD (SCD)
AB // CD
Ta c:
G (EFG) (SAD)
EF (EFG), AD (SAD)
EF // AD
(b)
S
A
B C
D
F
GH
E
x
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VD3:
= HD
B
A
C
D
I
P Q
M N
Ta c :
(MNPQ) (ABC) = MP
(MNPQ) (ACD) = NQ
(ABC) (ACD) = AC
M MP NQ = I (v MP v NQ khng song
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1
2 1 v G2G1G2 // CD
3
4
5trn BD sao cho KB = 2KD.
6
7
8
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1 (ABCD) (IJMN) = MN. M IJ // CD
2
1
1 2 1 21 2
2
2IG IC
IG IG G G 23 G G //CDIC ID CD 32
IG ID3
3
BD // CE (FBD) (FCE) = Ft // BD // CE.
4
525a 51
S144
6 PI
O HNO (ABC)
HN (ABC)O (ABC) PI,HN,BC ng quy.
O PIO (SBC)
PI (SBC)
7
A'C' B'D' O' (1)
O' A 'C'O' (SAC)
A 'C' (SAC)
O' B'D'O' (SBD)
B'D' (SBD)
(SAC) (SBD) SO O' SO (2)
T (1) v (2) pcm
8