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Mathematics, 10.09.2021 14:00 Kategaldamez3
Cho tam giác ABC vuông tại A. Lấy điểm M là một điểm bất kì thuộc cạnh BC. Gọi MD là đường vuông góc kẻ từ M đến AB, ME là đường vuông góc kẻ từ M đến AC, O là giao điểm của AM và DE.
a) Chứng minh ΔADM = ΔMEA.
b) Chứng minh O là trung điểm của AM và DE.
c) Điểm M ở vị trí nào trên cạnh BC thì AM có độ dài nhỏ nhất?
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Cho tam giác ABC vuông tại A. Lấy điểm M là một điểm bất kì thuộc cạnh BC. Gọi MD là đường vuông góc...
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