Họ và tên:..............................................................................
Lớp 7B
Kiểm tra 45 phút
Môn: hình học lớp 7









Đề bài :
A. Trắc nghiệm:
I .(2đ)Khoanh tròn chữ cái đứng trước câu trả lời đúng.
1. Cho tam giác ABC ta có :
A. B. C. D.
2. Tam giác có một góc vuông gọi là:
A.Tam giác cân; B.Tam giác đều; C.Tam giác vuông; D.Tam giác vuông cân
3.Trong tam giác đều, mỗi góc bằng :
A. 450 B. 600 C. 900 D. 1800
4.Tam giác nào là tam giác vuông trong các tam giác có độ dài ba cạnh như sau :
A 7m, 7m, 10m. B. 3cm, 4cm, 5cm. C. 6dm, 7dm, 8dm
II. (2 đ) Điền (Đúng, Sai) cho các khẳng định sau đây:
TT
Nội dung
 Đúng, Sai

1
Nếu 3 góc của tam giác này bằng 3 góc của tam giác kia thì hai tam giác đó bằng nhau.


2



3
Trong một tam giác, có ít nhất là hai goc nhọn.


4
Nếu là góc ở đáy của một tam giác cân thì


B. Tự luận:
Bài 1. (3 đ) Cho tam giác cân DEF (DE = DF). Trên cạnh EF lấy hai điểm I,K sao cho EI = KF. Chứng minh DI = DK.
Câu 2: (3 đ) Cho (ABC , kẻ AH
BC . Biết AB = 5cm ; BH = 3cm ; BC = 10cm (hình vẽ).


Tính độ dài các cạnh AH, HC, AC
Bài làm

.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................................................................................... .............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
.............................................................................................................................................................................................................................................................................................................................................................
............................................................................................................................................................................................................................................................................................................................................................
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Họ và tên:..............................................................................
Lớp7C
Kiểm tra 45 phút
Môn: hình học lớp 7









Đề bài :
Câu 1 (1điểm). Trên mỗi hình sau có các tam giác nào bằng nhau? Tại sao?


a)



b)

Câu 2 (1điểm). Chọn phương án trả lời đúng :
a) Cho
ABC cân tại A, có góc B = 700 góc A bằng :
A. 700 B. 1400 C. 400 D. 1000
b) Cho
DEF có DE = DF ; góc D = 900. Số đo góc E bằng :
A. 600 B. 450 C. 400 D. 500
Câu 3 (2điểm).
Điền dấu “x” vào vào ô trống một cách hợp lí
Câu
Đúng
Sai

a, Tam giác vuông có hai góc nhọn bằng nhau là tam giác vuông cân.



b, Tam giác cân có một góc bằng 600 là tam giác đều.



c, Nếu ba góc của tam giác này lần lượt bằng ba góc của tam giác kia thì hai tam giác đó bằng nhau.



d, Trong tam giác vuông bình phương một cạnh góc vuông bằng bình phương cạnh huyền trừ đi bình phương cạnh góc vuông kia.



Câu 4 (1điểm).
Tìm độ dài x trên các hình vẽ sau :


(a) (b)
Câu 5 (5điểm).Cho góc nhọn xOy. Gọi M là một điểm thuộc tia phân giác của góc xOy. Kẻ MA ( Ox (AOx), Kẻ MB( Oy (BOy)
a) Chứng minh MA = MB và là tam giác cân.
b) Đường thẳng BM cắt Ox tại D, đường thẳng AM cắt Oy tạ