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KiÓm tra bµi cò
1/ VÏ 1 gãc bÑt vµ ®Æt tªn ?
2/VÏ 1 tia n»m gi÷a hai c¹nh cña gãc, ®Æt tªn tia ®ã ?
Trªn h×nh võa vÏ cã mÊy gãc ? ViÕt tªn c¸c gãc ®ã ?
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Thướ c đo góc
* §Æt th- íc sao cho t©m cña th- íctrïng víi ®Ønh cña gãc.* Mét c¹nh cña gãc ®i qua v¹ch sè 0 cña th- íc, c¹nh cßn l¹i cña gãc®i qua v¹ch nµo th× ®ã lµ sè ®o cña
ãc cÇn ®o.
T©m cña th- ícV¹ch sè 0
¹c s
1050
xOy = 1050
O
x
y
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H·y ®äc sè ®o c¸c gãc sau?
I
m
n
1650
U
t
v700
x yO
*NhËn xÐt:- Mçi gãc cã mét sè ®o, sè ®o cña gãc bÑt lµ 1800.- Sè ®o cña mçi gãc kh«ng v- ît qu¸ 1800 .
1800
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§o ®é më cña c¸i kÐo (h11),cña com pa (h.12)?1
600
500
H×nh 11
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§Æt th- íc nh- c¸c h×nh vÏ sau cã ®o ®- îc gãc xOy kh«ng?
x
y
x
y Kh«ng ®o ®- îc gãc xOy v× t©mcña th- íc kh«ng ®Æt trïng víi®Ønh cña gãc.
Ta còng tÝnh ®- îc xOy nh- sau:
xOy = 1250 200 = 1050
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V¹ch sè 105 V¹ch sè 105
x
y
OOx
y
a) Trªn th- íc ®o gãc ng- êi ta ghi c¸c sè tõ 0 ®Õn 180 ë hai vßngcung theo hai chiÒu ng- îc nhau ®Ó viÖc ®o gãc ®- îc thuËn tiÖn.(h×nh 13)b) Các đơ n vị góc nhỏ hơ n độ là phút k í hiệu là ' và giây k í hiệu
là ".10 = 60' ; 1' = 60"
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- So s¸nh hai gãc b»ng c¸ch so s¸nh sè ®o cña chóng.
- Hai gãc b»ng nhau nÕu sè ®o cña chóng b»ng nhau.
- Gãc cã sè ®o lín h¬n lµ ãc lín h¬n, ãc cã sè ®o nhá h¬n lµgãc nhá h¬n.
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? So s¸nh ®é lín c¸c gãc ë h×nh vÏ sau
350
y
x
v
350
1420
s
tOTa cã: xOy = uIv xOy < sOt
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?2
B
Ở H.16,điểm I là trung điểm
của đoạn thẳng BC.
a, Hãy đo c¸c góc BAI , gãcIAC , gãc ACI, gãc BIA?
b, So s¸nh:
450
BAI < IAC
C
I
A
gãc BAI vµ gãc IAC,
gãc IAC vµ gãc ACI,
gãc ACI vµ gãc BIA?
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Góc vuông Góc nhọn Góc tù Góc bẹt
Bảng tóm tắt nhận biết một số góc thông dụng.
Hình 1 Hình 2 Hình 3 Hình 4pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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Bµi 1/S¸ch LT
Chän c¸c ch÷ c¸i vµ c¸c ch÷ sè ®Ó cã mét kh¼ng ®Þnh®óng.
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12
39
10
11 1
2
65
48
7
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y
z
t
Bài t ậ p 11: Nhìn hình 18 sgk .
Đọc số đo các xOy, xOz, xOt
O x
xOy = 500
xOz = 1000
xOt = 1300
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1/ Häc:- Häc kü lý thuyÕt- Thùc hiÖn lµm l¹i c¸c bµi tËp vµ vÝ dô ®· häc ë trªn líp.
Lµm bµi tËp :15, 16 (SGK – tr80) va S LT2/ Lµm:
H- íng dÉn vÒ nhµ
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O y
x
O y
x
O y
x
xOy = 900
Gãc vu«ng00 < < 900
Gãc nhän900 < < 1800
Gãc tï
x yO
xOy = 1800 Gãc bÑt
• Gãc cã sè ®o b»ng 900 lµ gãc vu«ng, ký hiÖu lµ 1v• Gãc nhá h¬n gãc vu«ng lµ gãc nhän.• Gãc lín h¬n gãc vu«ng nh- ng nhá h¬n gãc bÑt lµ gãc tï.pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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x
O y
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x x
x
O y
900
O y
O y
xOy = 900
Gãc vu«ng00 < < 900
Gãc nhän900 < < 1800
Gãc tï
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Bµi 2/S LT
12
39
10
11 1
2
Gãc lóc giê cã sè ®o b»ng 600
Gãc lóc 3 giê cã sè ®o b»ng 900
Gãc lóc 5 giê cã sè ®o b»ng 1500
Gãc lóc 6 giê cã sè ®o b»ng 1800
Gãc lóc 10 giê cã sè ®o b»ng 600
65
48
7
c c g c s o ng
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Chuùc möøng quyù Thaày, Coâ cuøng taäp theå hs lôùp 6a..Moät muøa xuaân vui veû !
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Thôøi gian thaûo luaän nhoùm vaø ño 6 goùc : 3 phuùt
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Thôøi gian ño 3 goùc : 2 phuùt
SEIKO
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Thôøi gian ño 3 goùc : 2 phuùt
SEIKO
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L
1. §o gãca) Dông cô ®o:
sè ®o gãc
b) C¸ch ®o:c) §¬n vÞ ®o: 2. So s¸nh hai gãc 3. Gãc vu«ng, gãc nhon,
gãc tï.
• Gãc cã sè ®o b»n 900 lµ ãc
Bài t ậ p 11: Nhìn hình 18 sgk .
Đọc số đo các xOy, xOz, xOt
Bài t ậ p 12: Đo các ABC, ACB,
BAC ở hình 19 Bài t ậ p 13: Đo các ILK, IKL,
LIK ở hình 19
I K900 450
450
vu«ng, ký hiÖu lµ 1v• Gãc nhá h¬n gãc vu«ng lµ gãcnhän.• Gãc lín h¬n gãc vu«ng nh- ng nhá h¬n gãc bÑt lµ gãc tï.
LIK = 900 IKL = 450
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1. §o gãca) Dông cô ®o:
sè ®o gãc
b) C¸ch ®o:c) §¬n vÞ ®o: 2. So s¸nh hai gãc 3. Gãc vu«ng, gãc nhon,
gãc tï.
• Gãc cã sè ®o b»n 900 lµ ãc
Bài t ậ p 11: Nhìn hình 18 sgk .
Đọc số đo các xOy, xOz, xOt
Bài t ậ p 12: Đo các ABC, ACB,
BAC ở hình 19
A
vu«ng, ký hiÖu lµ 1v• Gãc nhá h¬n gãc vu«ng lµ gãcnhän.• Gãc lín h¬n gãc vu«ng nh- ng nhá h¬n gãc bÑt lµ gãc tï. 600 600
600
B C
ABC = 600
ACB = 600
BAC = 600pd f Mach ine - i s a pd f wr i te r tha t p roduces qua l it y PDF f i les w i th ease !
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1
2900
1800
sè ®o gãc
Bµi 14 (SGK/75): Xem h×nh 21. ¦íc l- îng b»ng m¾t xem gãc nµovu«ng, nhän, tï, bÑt. Dïng gãc vu«ng cña e ke ®Ó kiÓm tra l¹i kÕt qu¶.Dïng th- íc ®o gãc t×m sè ®o mçi gãc.
3
4
5 6
600
1500
900300
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