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Mathematics, 15.06.2021 14:00 vick67

Cho tam giác abc vuông tại a, đường cao ah. a, chứng minh tam giác abh đông dạng với tam giác cba
b, cho bh bắng 4cm, bc bằng 13cm, tính độ dài đoạn ab
c, gọi e là điểm tùy ý trên cạnh ab, đường thẳng qua h và vuông góc với he cắt cạnh ac tại f. chứng minh ae. ch bằng ah. fc.
d, tìm vị trí của điểm e trên cạnh ab để tam giác ehf có diện tích nhỏ nhất

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Cho tam giác abc vuông tại a, đường cao ah. a, chứng minh tam giác abh đông dạng với tam giác cba <...
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