Duong thang va mat phang song song.pdf
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P
d
d (P)
d // d' d // (P)d ' (P) P
d
d'
th a // d.
a
d
P
Q
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TOPPER. Ch
VD1:
=HD
S
A
B C
D
K
O
H
I
E
G
(a)
CG 2.
CH 3
EG // BH, BH (SAB) EG // (SAB).CE 2
CB 3(b)
BC
Ta c:
Ta c:
Trong tam gic SB!, I" // S!.
(IAC) S! // (IAC).
OB OD BO 1.
BK 4BD DK
I SB BI 1.
BS 4IS 3IB
BO BI 1
BK BS 4
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2 #, G$
(a) G#G$// (ABC). (b) G#G$// (AB%).
3
4
5
&' AB.
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hnh ch.
VD2:
=HD
S
A B
CD
EF
H G Ta c:
F (P) (ABCD)
(P) // CD,CD (ABCD)
AB // CD
(P)// AB(P) //CD
(SA%) * HE, (+) (SBC) * G
' HE * C *
S- ra: EGH ' hnh thang c0n.
1 1SD a.
2 2
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VD2:
H G
FEM
E, ta c:HM EF,
1 aEM (EF GH) .
2 4
Trong tam gic &-1ng HE ta c:
2 2 22 2 2 a a 3a
HM EH EM4 16 16
a 3HM .
42
EFGH
1 1 a a 3 3a 3S (EF GH).HM (a )
2 2 2 4 16
=HD
A
B
C
D
E
F
H
G
Ta c: E (P) (BCD)
(P)//CD,CD (BCD)
(+) (ABC) * EH // AB, H AC2
(+) (AC%) * HG // C%, G A%2
(+) (AB%) * G // AB.
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2
3#&' G$
#G$&' 3ong 3ong
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12G#G$// AB.3
4 #// %E, GG# * %E.S- ra %G#
5
(a)
6
7
8 #
$
BD//IJ BD//(AIJ)
CE // KH
(b) MN //EC//HK1
MN HK EC3
