Bài kiểm tra chương I I

Trường THCS Chi Đông BÀI KIỂM TRA 45’ HÌNH HỌC 7
Họ và tên:………………………………… Chương II
Lớp:………………………………………

Điểm
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Đề bài :
Bài 1 (3 điểm)
a) Phát biểu trường hợp bằng nhau cạnh-góc-cạnh của hai tam giác.
Vẽ hình minh họa.
b) Cho (ABC và (DEF có: AB = DE; A = D; BC = EF.
Hỏi (ABC và ( DEF có bằng nhau hay không? Giải thích.
Bài 2 (2 điểm)
Điền dấu "X" vào chỗ trống (...) một cách thích hợp:
Câu
Đúng
Sai

a) Tam giác vuông có một góc bằng 45o là tam giác vuông cân.
b) Góc ngoài của một tam giác lớn hơn góc trong kề với nó.
...
...
...
...

Bài 3 (5 điểm)
Cho tam giác cân ABC có AB = AC = 5 cm, BC = 8 cm. Kẻ AH vuông góc với BC (H ( BC)
a) Chứng minh HB = HC và BAH = CAH
b) Tính độ dài AH.
c) Kẻ HD vuông góc với AB (D ( AB), kẻ HE vuông góc với AC (E ( AC).
Chứng minh tam giác HDE là tam giác cân.
Bài làm:.
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Đáp án và biểu điểm Đề số 1
Bài 1 (3 điểm)
a) Phát biểu trường hợp bằng nhau c.g.c 1 điểm
- Vẽ hình minh họa có kí hiệu đúng 0,5 điểm
b) (ABC không bằng (DEF 1 điểm
- Giải thích đúng 0,5 điểm
Bài 2 (2 điểm)
a) đánh dấu "X" vào ô Đúng 1 điểm
b) đánh dấu "X" vào ô Sai 1 điểm
Bài 3 (5 điểm) Vẽ hình đúng, có kí hiệu đúng 1 điểm
Viết GT, KL đúng 1 điểm
a) Chứng minh HB = HC và BAH = CAH 1 điểm
b) Tính đúng AH = 3 cm 1 điểm
c) Chứng minh được HD = HE
( (HDE cân 1 điểm