Kiểm tra một tiết chương III lớp: 8 môn: Hình học

Trường THCS Xuân Áng KIỂM TRA MỘT TIẾT CHƯƠNG III
Lớp: 8 __ Môn: Hình học
Họ và tên: ____________________
Điểm
Lời phê của thầy (cô) giáo
ĐỀ BÀI
Câu 1 (3 đ) Cho ABCD ( hai đáy là AB và CD ), đường kéo dài của AD và BC cắt nhau tại M.
 Tính độ dài cạnh CD biết: AB = 12 cm và AD = AM
Câu 2 (3 đ): Cho A’B’C’ # ABC . 
Biết AB = 5 cm, AC = 6 cm, BC = 7 cm và A’B’C’ có chu vi bằng 72 cm . 
Tìm độ dài các cạnh của A’B’C’ . 
Câu 3 (4 đ): Cho hình chữ nhật ABCD có AB = 8cm, BC = 6cm. 
Vẽ đường cao AH của tam giác ADB. 
a. Chứng minh: # 
b. Chứng minh: AD2 = DH.DB 
c. Tính độ dài đoạn thẳng DH, AH? 
BÀI LÀM
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