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ntt1120
2 năm trước
BÀI 1: Cho tam giác nhọn ABC. Kẻ AH vuông góc BC (H thuộc BC ). Biết AB = 13 cm; AH = 12 cm và HC = 16 cm. Tính chu vi tam giác ABC. BÀI 2: Cho tam giác ABC cân tại A. Trên tia đối của tia BC và CB lấy theo thứ tự hai điểm Q và R sao cho BQ = CR. a) Chứng minh AQ = AR b) Gọi H là trung điểm của BC. Chứng minh : QAH RAH
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