Kiểm tra một tiết chương II lớp: 7a môn: Hình học

Trường THCS Xuân Áng KIỂM TRA MỘT TIẾT CHƯƠNG II
Lớp:7A Môn: Hình học
Họ và tên: ______________________
 Điểm
Lời phê của thầy (cô) giáo
ĐỀ BÀI.
Câu 1 (3đ)
a) Phát biểu định nghĩa tác giác cân. Nêu tính chất về góc của tác giác cân.
b) Cho ABC cân tại A, có = 700. Tính và ;
Câu 2 (2đ) Cho góc xOy khác góc bẹt. Một điểm M nằm trong góc xOy, từ M kẻ MA Ox
 	() , MBOy () sao cho MA=MB.
Chứng minh rằng: OA = OB.	
 Câu 3 (5đ)
Cho ABC có AB = AC = 5 cm; BC = 8 cm. Kẻ AH BC (HBC)
a) Chứng minh HB = HC và 
b) Tính độ dài AH.
c) Kẻ HD AB (DAB); HE AC (EAC). CMR: HDE là tam giác cân.
BÀI LÀM
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