B
A
C
H
H
B
C
A
y
x
4 16
C
B
A
30
5 cm
I. trắc nghiệm (3 điểm):
* Khoanh tròn chỉ một chữ cái in hoa đứng trớc câu trả lời đúng:
Cõu 1:Cho tam giỏc ABC vuụng ti A, ng cao AH (hỡnh 1 ), h thc no sau õy
l ỳng
A . cosC =
AC
AB
B. tg B =
AC
AB
Hỡnh 1
C. cotgC =
HC
HA
D. cotgB =
AB
AC
Cõu 2 : Tỡm x trong tam giỏc ABC vuụng ti A, ng cao AH (hỡnh 2):
A. x = 8 B. x = 4
5
C. x = 8
2
D. x = 2
5
Cõu 3: Tỡm y trong hỡnh 2 Hỡnh 2
A . y = 8 B. y = 2
5
C. y = 8
2
D. y = 8
5
Cõu 4 : Cho tam giỏc ABC vuụng ti A cú BC=5cm,
à
C
= 30
0
(hỡnh 3), trng hp no sau õy l ỳng:
A. AB = 2,5 cm B. AB =
5 3
2
cm Hỡnh 3
C. AC = 5 3 cm D. AC = 5
3
3
cm.
Cõu 5: Cho
l gúc nhn , h thc no sau õy l ỳng:
A. sin
2
- cos
2
= 1 B. tg
=
sin
cos
C. sin
2
+ cos
2
= 1 D. cotg
=
cos
sin
Cõu 6 : H thc no sau õy l ỳng:
A. sin 50
0
= cos30
0
B. tg 40
0
= cotg60
0
C. cotg50
0
= tg45
0
D. Sin80
0
= Cos 10
0
II. Tự luận (7 điểm)
Cõu 7: ( 3 m) Gii tam giỏc vuụng ABC bit
à
A
= 90
0
, AB = 6 , AC =10 (Kt qu v
gúc lm trũn n phỳt, v cnh lm trũn n ch s thp phõn th2)
Cõu 8: (3 im) Cho tam giỏc DEF, bit
à
D
= 90
0
,
à
E
= 60
0
, EF = 8 cm . Tớnh:
a/ Cnh DE; b/ ng cao DH
c/ Gi DI l phõn giỏc ca gúc
à
D
( I
E F ).Tớnh HI (lm trũn n 2 ch s thp
phõn).
Cõu 9: (1 im) Cho tam giỏc ABC (AB<AC)
à
0
C = <45
, ng trung tuyn AM;
ng cao AH, MA=MB=MC=a. Chng minh rng:
sin 2=2sincos
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Trêng thcs xu©n khanh
BµI kiÓm tra 1 TIÕT
Hä vµ tªn: ........................................
N¨m häc: 2010 - 2011
Líp: 9…
M«n: H×nh häc (TiÕt 19)
§iÓm
Lêi phª cña gi¸o
viªn
B
A
C
H
C
B
A
H
x y
9 16
C
B
A
60
5cm
I. trắc nghiệm (3 điểm):
* Khoanh tròn chỉ một chữ cái in hoa đứng trớc câu trả lời đúng:
Cõu 1:Cho tam giỏc ABC vuụng ti A, ng cao AH (hỡnh 1), h thc no sau õy l
ỳng
A . cosB =
AC
AB
B. tg C =
AC
AB
Hỡnh 1
C. cotgB =
HC
HA
D. CotgB =
AB
AC
Cõu 2:Tỡm x trong tam giỏc ABC vuụng ti A,ng cao AH(hỡnh 2):
A. x = 15 B. x = 5 C. x = 7 D. x =12 Hỡnh 2
Cõu 3: Tỡm y trong hỡnh 2:
A. y = 8 B. y = 12
C. y = 7 D. y = 20
Cõu 4: Cho tam giỏc ABC vuụng ti A (hỡnh 3 ) cú AC = 5 cm,
à
C
= 60
0
,
trng hp no sau dõy l ỳng:
A/ AB =
5 3
2
cm B/ AC = 2,5 cm
C/ AB = 5 3 cm D/ AC =
5 3
3
cm Hỡnh 3
Cõu 5:Cho
l gúc nhn, h thc no sau õy l ỳng:
A. sin
2
+ cos
2
= 1 B. tg
=
sin
cos
C. sin
2
+ cos
2
= - 1 D. cotg
=
cos
sin
Cõu 6 : H thc no sau õy l ỳng:
A. sin 50
0
= cotg 40
0
B. tg 25
0
= cotg 65
0
C. cotg 50
0
= tg30
0
D .Cos 20
0
= tg 70
0
II. Tự luận (7 điểm)
Cõu 7 ( 3 im): Gii tam giỏc vuụng ABC bit = 90
0
, AB = 5 , AC =7 ( Kt qu v gúc
lm trũn n phỳt, v cnh lm trũn n ch s thp phõn th 2 )
Cõu 8 (4 im): Cho tam giỏc MNP, bit
à
M
= 90
0
,
à
N
= 30
0
, NP = 10 cm . Tớnh:
a/ Cnh MP; b/ ng cao MH.
c/ Gi MI l phõn giỏc ca gúc
à
M
( I
NP ), Tớnh HI (lm trũn n 2 ch s thp
phõn)
Cõu 9: (1 im) Cho tam giỏc ABC (AB<AC)
à
0
C = <45
, ng trung tuyn AM;
ng cao AH, MA=MB=MC=a. Chng minh rng:
2
1 cos2=2cos
+
Bài làm
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Đề II
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Trêng thcs xu©n khanh
BµI kiÓm tra 1 TIÕT
Hä vµ tªn: ........................................
N¨m häc: 2010 - 2011
Líp: 9…
M«n: H×nh häc (TiÕt 19)
I. tr¾c nghiÖm (3 ®iÓm):
§Ò III
§iÓm
Lêi phª cña gi¸o
viªn
C
B
A
H
x y
9 16
B
A
C
H
B
A
C
5
30
* Khoanh tròn chỉ một chữ cái in hoa đứng trớc câu trả lời đúng:
Cõu 1:Cho tam giỏc ABC vuụng ti A, ng cao AH (Hỡnh 1 ), h thc no sau õy l ỳng :
A. sinC =
AC
AB
B. cotg B =
AB
AC
Hỡnh 1
C. tg B =
AC
AB
D. cos C =
BC
AC
Cõu2 : Tỡm x trong tam giỏc ABC vuụng ti A, ng cao AH (hỡnh 2):
A. x = 12 B. x = 1 5
C. x = 5 D. x = 7 Hỡnh 2
Cõu 3 : Tỡm y trong hỡnh 2:
A . y = 7 B. y = 20
C. y = 8 D. y =1 2
Cõu 4 : Cho tam giỏc ABC vuụng ti A (hỡnh 3),
cú
à
C
= 30
0
AB= 5 , trng hp no sau õy l ỳng:
A. AC = 10 B. AC =
5 3
3
Hỡnh 3
C. AC = 5 3 D. AC =
5
2
Cõu 5 : Cho
l gúc nhn, h thc no sau õy l ỳng:
A. sin
2
. cos
2
= 1 B. cotg
=
sin
cos
C. tg
. cotg
= -1 D. cotg
=
cos
sin
Cõu 6: H thc no sau õy l ỳng:
A. sin35
0
= cos45
0
B. tg 40
0
= cotg60
0
C. cos50
0
= sin30
0
D. Cotg 10
0
= tg 80
0
II. Tự luận (7 điểm)
Cõu 7: ( 3 m) Gii tam giỏc vuụng ABC bit = 90
0
, AB = 6 , AC =7 (Kt qu v gúc
lm trũn n phỳt, v cnh lm trũn n ch s thp phõn th 2)
Cõu 8: (3 im) Cho tam giỏc PQR, bit
$
P
= 90
0
,
à
Q
= 60
0
, QR = 6 cm. Tớnh:
a/ Cnh PQ; b/ ng cao PI.
c/ Gi PM l phõn giỏc ca
ã
QPR
( M
QR). Tớnh IM (lm trũn n 2 ch s thp
phõn )
Cõu 9: (1 im) Cho tam giỏc ABC (AB<AC)
à
0
C = <45
, ng trung tuyn AM;
ng cao AH, MA=MB=MC=a. Chng minh rng:
sin 2=2sincos
Trờng thcs xuân khanh
BàI kiểm tra 1 TIếT
Họ và tên: ........................................
Năm học: 2010 - 2011
Lớp: 9
Môn: Hình học (Tiết 19)
I. trắc nghiệm (3 điểm):
Đề IV
Điểm
Lời phê của giáo
viên