TẬP ĐỀ KIỂM TRA 1 TIẾT CHƯƠNG I HÌNH 8

Họ và Tên : . . . . . . . . . . . . . . . . . . ......... KIỂM TRA I TIẾT ( BÀI SỐ 2)
Lớp: 8A MÔN: HÌNH HỌC 8
Điểm




Lời phê của thầy cô giáo
Chữ kí PHHS


Bài 1: (4 điểm) Cho tam giác ABC vuông tại A. Gọi D, E, F lần lượt là trung điểm của AB, AC, BC.
Chứng minh DE là đường trung bình của tam giác ABC.
Tính độ dài DE và AF cho biết BC = 12cm.
So sánh DE và AF.
Bài 2: (6 điểm) Cho tam giác ABC cân tại B. Gọi M, N lần lượt là trung điểm BA, BC; đoạn thẳng AN và CM cắt nhau tại G.
Chứng minh: MN là đường trung bình của tam giác ABC, G là điểm đặc biệt gì của tam giác ABC? Vì sao?
Chứng minh tứ giác AMNC là hình thang cân.
BG cắt AC tại K. Tứ giác AMNK là hình gì? Vì sao?
Tìm điều kiện của tam giác ABC để tứ giác AMNK là hình thoi.
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Họ và Tên : . . . . . . . . . . . . . . . . . . ......... KIỂM TRA I TIẾT ( BÀI SỐ 2)
Lớp: 8A MÔN: HÌNH HỌC 8
Điểm




Lời phê của thầy cô giáo
Chữ kí PHHS


Bài 1: (4 điểm) Cho tam giác PMN vuông tại P, có PH là trung tuyến, cho biết PM = 9cm, PN = 12cm.
Tính độ dài MN và PH.
Từ H vẽ các đường thẳng song song PN và PM cắt PM tại E và PN tại F. Tính độ dài EF.
So sánh EF và PH.
Bài 2: (6 điểm) Cho tam giác ABC cân tại A, AH là đường trung tuyến. Gọi O là trung điểm AC, K là điểm đối xứng của H qua O.
Chứng minh: tứ giác AOHB là hình thang.
Chứng minh: tứ giác AHCK là hình chữ nhật.
Chứng minh: tứ giác AKHB là hình bình hành.
Tìm điều kiện của tam giác cân ABC để tứ giác AHCK là hình vuông.
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Họ và Tên : . . . . . . . . . . . . . . . . . . ......... KIỂM TRA I TIẾT ( BÀI SỐ 2)
Lớp: 8A MÔN: HÌNH HỌC 8
Điểm




Lời phê của thầy cô giáo
Chữ kí PHHS

ĐỀ: 1
I. Trắc nghiệm : Khoanh tròn chữ cái trước phương án trả lời đúng (3đ). 1. Tứ giác ABCD có
= 1200;
= 800 ;
= 1000 thì: A.
= 1500 B.
= 900 C.
= 400 D.
= 600 2. Hình chữ nhật là tứ giác: A. Có hai cạnh vừa song song vừa bằng nhau. B. Có bốn góc vuông. C. Có bốn cạnh bằng nhau và bốn góc vuông D. Có bốn cạnh bằng nhau.