Bài 5 (3 điểm): Cho hình chữ nhật ABCD (AB > BC). Kẻ AH vuông góc với BD tại H. a) Chứng minh rằng: AADHABDA. Tính độ dài đoạn thẳng BD, AH? Biết AB = 4cm, BC = 3cm. b) Chứng minh AAHB = ABCD. Từ đó suy ra: BH.BD=CD2 c) Tia AH cắt cạnh DC tại E và cắt cạnh BC kéo dài tại F. Gọi I là trung điểm của BE, K là trung điểm của DF. Chứng minh rằng: IK vuông góc CH

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03-06-2024
Mathematics

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Bài 5 (3 điểm): Cho hình chữ nhật ABCD (AB > BC). Kẻ AH vuông góc với BD tại H. a) Chứng minh rằng: AADHABDA. Tính độ dài đoạn thẳng BD, AH? Biết AB = 4cm, BC = 3cm. b) Chứng minh AAHB = ABCD. Từ đó suy ra: BH.BD=CD2 c) Tia AH cắt cạnh DC tại E và cắt cạnh BC kéo dài tại F. Gọi I là trung điểm của BE, K là trung điểm của DF. Chứng minh rằng: IK vuông góc CH

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