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kiyato160
2 năm trước
VẼ HÌNH GIÚP MÌNH NỮA NHA Cho góc xAy bằng 90 độ, trên tia Ax lấy điểm B sao cho AB = 9cm, trên tia Ay lấy điểm C sao cho AC = 12cm. Qua B kẻ đường thẳng vuông góc với Ax, qua C kẻ đường thẳng vuông góc với Ay, hai đường thẳng này cắt nhau tại D. a) Tứ giác ABDC là hình gì? Vì sao? b) Kẻ CH vuông góc với AD ( H thuộc AD) cắt BD ở E. Chứng minh tam giác CHD đồng dạng với tam giác CDE c) Tính AH. d) Gọi K là giao điểm CE và tia Ax. Chứng minh CH . CE + AK . CD = AD^2
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