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trung2nghin
2 năm trước
Bài 6: Cho hình chữ nhật ABCD có AB = 5cm, AD = 6cm, BI đường cao của tam giác ABC. a. Tính độ dài đoạn BI. IA, AC. b. Qua B kẻ đường thẳng d// AC, cắt tia DA tại K. Chứng minh: ∆𝐾𝐴𝐵 đồ𝑛𝑔 𝑑ạ𝑛𝑔 ∆𝐶𝐼𝐵 và BC2 = IC.KB. c. Tính diện tích tứ giác AIBK
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