KIEM TRA CHUONG I HINH HOC

Trờng THCS Vĩnh Quang Bài kiểm tra một tiết chơng I
Môn: Hình học
Họ và tên : .........................................................................................
Lớp : ........................
Điểm Lời nhận xét của giáo viên
Đề bài
A/ Trắc nghiệm khách quan:
Bài 1: Hãy chọn dấu x vào ô trống:
Câu
Nội dung Đúng Sai
1
Hai đờng thẳng: a, b phân biệt cùng song
song với đờng thẳng thứ 3 thì: a //b
2
Hai đờng thẳng song song là 2 đờng thẳng
phân biệt không cắt nhau
3 Hai đờng thẳng cắt nhau thì vuông góc
4
Nếu 2 đờng thẳng a, b cắt đờng thẳng c
mà trong các góc tạo thành có một cặp
góc trong cùng phía bù nhau thì a //b
Bài 2: Khoanh tròn định lí mà em cho là đúng.
A. a c
gt: b c
Kl: a //b
B. Hai góc đối đỉnh thì bằng nhau
B/ Tự luận.
Bài 1 a) Vẽ đờng trung trực của đoạn thẳng AB dài 5 cm
b) Vẽ tia phân giác của góc x0y = 90
0
Bài 2 : Cho đt: Nếu 2 đờng thẳng cùng vuông góc với đt thứ 3 thì chúng song song với

nhau.
Hãy vẽ hình và ghi gỉa thiết kết luận của định lí.
Bài 3: Cho hình vẽ
Biết: a //b
a
b
A
B
O
30
0
45
0
A
ˆ
= 30
0
;
B
ˆ
= 45
0
TÝnh sè ®o gãc AOB ?
Bµi lµm phÇn tù luËn
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