HÌNH HOÏC 6
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Transcript of HÌNH HOÏC 6
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HÌNH HOÏC 6
Baøi : ÑÖÔØNG THAÚNG ÑI QUA HAI ÑIEÅM
Thieát keá giaùo aùn : Phaïm Vuõ Thanh Bình
Tel : 0905177397
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KIEÅM TRA BAØI CUÕ
– Khi naøo 3 ñieåm A, B, C thaúng haøng, khoâng thaúng haøng ?
– Cho ñieåm A. Veõ ñöôøng thaúng ñi qua ñieåm A. Theo em, ta coù theå veõ ñöôïc bao nhieâu ñöôøng thaúng nhö theá ?
Ba ñieåm A, B, C cuøng naèm treân moät ñöôøng thaúng thì thaúng haøngBa ñieåm A, B, C khoâng cuøng naèm treân moät ñöôøng thaúng thì khoâng thaúng haøng
Veõ ñöôïc voâ soá ñöôøng thaúng ñi qua A
A
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KIEÅM TRA BAØI CUÕ– Cho ñieåm B khaùc ñieåm A, veõ ñöôøng thaúng
ñi qua hai ñieåm A vaø B
– Theo em ta coù theå veõ ñöôïc bao nhieâu ñöôøng thaúng nhö theá ?
A
B
Veõ ñöôïc duy nhaát moät ñöôøng thaúng ñi qua hai ñieåm A, B
A
B
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Tieát 3 : ÑÖÔØNG THAÚNG ÑI QUA HAI ÑIEÅM
1. Veõ ñöôøng thaúng
Ñeå veõ ñöôøng thaúng ñi qua hai
ñieåm A, B nhö treân, baïn ñaõ
veõ nhö theá naøo ?
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Tieát 3 : ÑÖÔØNG THAÚNG ÑI QUA HAI ÑIEÅM
1. Veõ ñöôøng thaúng
A
B
THÖÔÙC
THAÚNG
Ñaët caïnh thöôùc ñi qua hai ñieåm A vaø B Duøng buùt chì vaïch theo thöôùc
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Tieát 3 : ÑÖÔØNG THAÚNG ÑI QUA HAI ÑIEÅM
1. Veõ ñöôøng thaúng
A
B
Ta veõ ñöôïc bao nhieâu ñöôøng thaúng ñi qua 2 ñieåm A vaø B ?
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Tieát 3 : ÑÖÔØNG THAÚNG ÑI QUA HAI ÑIEÅM
1. Veõ ñöôøng thaúng
A
B
Chæ coù moät vaø chæ moät ñöôøng thaúng ñi qua hai ñieåm A vaø B
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2. Teân ñöôøng thaúng
ÔÛ tieát tröôùc, ta ñaët teân cho ñöôøng thaúng nhö theá naøo ?
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2. Teân ñöôøng thaúng
A
B
Ñöôøng thaúng AB
xy
Ñöôøng thaúng xy
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Haõy goïi teân ñöôøng thaúng treân ?
N
M
P
Ñöôøng thaúng NM Ñöôøng thaúng MN
Ñöôøng thaúng NP Ñöôøng thaúng PN
Ñöôøng thaúng MPÑöôøng thaúng PM
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3. Ñöôøng thaúng truøng nhau, caét nhau, song song
Veõ 3 ñieåm A, B, C khoâng thaúng haøng
A
B
C
Veõ hai ñöôøng thaúng AB vaø AC.
Hai ñöôøng thaúng naøy coù ñaëc ñieåm gì ?
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3. Ñöôøng thaúng truøng nhau, caét nhau, song song
A
B
C
– Ñöôøng thaúng AB vaø ñöôøng thaúng AC caét nhau. A laø giao ñieåm
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3. Ñöôøng thaúng truøng nhau, caét nhau, song song
M
N
P
Ñöôøng thaúng MN vaø ñöôøng thaúng MP coù bao nhieâu ñieåm chung ?
– Ñöôøng thaúng MN vaø ñöôøng thaúng MP truøng nhau
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3. Ñöôøng thaúng truøng nhau, caét nhau, song song
a
b
Ñöôøng thaúng a vaø ñöôøng thaúng bcoù ñieåm chung naøo khoâng?
– Ñöôøng thaúng a song song vôùi ñöôøng thaúng b
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- Hai ñöôøng thaúng maø khoâng truøng nhau goïi laø hai ñöôøng thaúng phaân bieät- Hai ñöôøng thaúng phaân bieät hoaëc chæ coù 1 ñieåm chung hoaëc khoâng coù ñieåm chung naøo
* Chuù yù : SGK
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BAØI TAÄP CUÛNG COÁ
Baøi 17/109/SGK