Trờng THCS Hồng Thuỷ
3 Hỡnh hc 9
Họ và tên:.............................
phút.
Lớp: 9.....
tra:.../....../2014
Điểm:
Kiểm tra bài số
Thời gian: 45
Ngày kiểm
Lời nhận xét của giáo viên:
Đề 1
Cõu 1: ( 2 im) Tớnh din tớch ca hỡnh qut trũn cung 60 0 ca hỡnh trũn cú bỏn kớnh
6cm ? Tớnh chu vi hỡnh trũn ú?
Cõu 2: ( 2 im) Tớnh di cung trũn cú bỏn kớnh bng 2 cm, ng gúc tõm l 120 0 ?
Tớnh din tớch hỡnh trũn ú?
Cõu 3: ( 2 im) Cho hỡnh trũn cú din tớch bng 78,5cm 2, Hóy tớnh chu vi v bỏn kớnh
ca ng trũn ú?
Cõu 4: (4 im) Cho ABC nhn, A 600 ni tip ng trũn (O; 6cm). V 2 ng
cao AE v CF ct nhau ti H.
a) Chng minh t giỏc BEHF ni tip
b) Chng minh t giỏc AFEC ni tip
c) Tớnh di cung nh BC
d). Chng minh ng thng OB vuụng gúc vi EF.
Bài làm
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Trờng THCS Hồng Thuỷ
3 Hỡnh hc 9
Họ và tên:.............................
phút.
Lớp: 9.....
tra:.../....../2014
Điểm:
Kiểm tra bài số
Thời gian: 45
Ngày kiểm
Lời nhận xét của giáo viên:
Đề 2
Cõu 1: ( 2 im) Tớnh din tớch ca hỡnh qut trũn cung 40 0 ca hỡnh trũn cú bỏn kớnh
4cm ? Tớnh chu vi hỡnh trũn ú?
Cõu 2: ( 2 im) Tớnh di cung trũn cú bỏn kớnh bng 4 cm, ng gúc tõm l 120 0 ?
Tớnh din tớch hỡnh trũn ú?
Câu 3: ( 2 điểm) Cho hình tròn có diện tích bằng 76,5cm 2, Hãy tính chu vi và bán kính
của đường tròn đó?
Câu 4: (4 điểm) Cho AMN nhọn, �A 600 nội tiếp đường tròn (O; 4cm). Vẽ 2 đường
cao AE và NF cắt nhau tại H.
a) Chứng minh tứ giác MEHF nội tiếp
b) Chứng minh tứ giác AFEN nội tiếp
c) Tính độ dài cung nhỏ MN
d). Chứng minh đường thẳng OM vuông góc với EF.
Bµi lµm
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