Đề thi Kiểm tra chương III môn hình học 8
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TRƯỜNG THCS NGUYỄN TẤT THÀNH NĂM HỌC 2007 – 2008 KIỂM TRA CHƯƠNG III Mã đề thi 01 MÔN HÌNH 8 Thời gian làm bài: 45 phút; Điểm Họ, tên thí sinh:..............................................................Lớp: 8.... @ ĐỀ BÀI: Câu 1:(3,5đ) Cho hình thang ABCD (AB//CD) có AB = 4cm, CD = 9cm góc ADB = góc BCD. Chứng minh rABD đồng dạng với rBDC. b) Tính độ dài BD. Câu 2:(5 đ) Cho rABC vuông ở A , AB = 6cm, AC = 8cm, đường cao AH, đường phân giác BD. Tính độ dài các đoạn AD, DC. Gọi I là giao điểm của AH và BD. Chứng minh AB . BI = BD . HB. Chứng minh rAID là tam giác cân. Câu 3 (1,5) Cho rABC (AB<AC). Đường cao kẻ qua trọng tâm G của tam giác cắt AB, AC lần lượt ở D và E. 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