Kiểm tra: 45 phút môn: Đại Số - Đề 4

<span class='text_page_counter'>(1)</span>Trường THCS xã Hàng Vịnh Hoï vaø teân hoïc sinh: ……………………………………………… Lớp: 7A……. Ñieåm. Kieåm tra: 15 phuùt Moân: Hình hoïc Lời phê của thầy (cô). ĐỀ BÀI I/ TRẮC NGHIỆM : ( 3 điểm ) Hãy khoanh tròn vào chữ cái đứng trước câu trả lời đúng nhất Câu 1: Tam giác nào là tam giác vuông trong các tam giác có độ dài ba cạnh như sau: A. 1cm, 2cm, 3cm B. 2cm, 3cm, 4cm C. 3cm, 4cm, 5cm D. 4cm, 5cm, 6cm Câu 2 : Cho ABC , có AB = 3cm, BC = 4cm, AC = 5cm. Vậy ABC là : A. Tam giác vuông tại A B. Tam giác vuông tại B C. Tam giác vuông tại C D. Tam giác cân tại A Câu 3 : Cho ABC vuông tại A, có AB = 5cm, AC = 12cm. Độ dài của cạnh BC là: A. 13 B. 14 C. 15 D. 17 TỰ LUẬN: ( 7 điểm ) Câu 4 ( 3 điểm ) Cho ABC vuông tại A, có AB = 5cm, AC = 12cm. Tính chu vi ABC ? Câu 5 ( 4 điểm ) : Cho ABC là tam giác nhọn. Kẻ AH  BC (H  BC) . Cho biết AB =13cm, AH = 12cm, HC = 16cm. Tính các độ dài AC, BC ?. Bài làm ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ Lop7.net.

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