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Mathematics, 02.11.2021 22:10 ginapogones4958

cho tam giác ABC vuông tại A ( AB < AC ) kẻ đường cao AK trên tia KC lấy điểm D sao cho KA =KD qua D kẻ đường thẳng vuông góc với BD cắt AC tại E gọi i là hình chiếu của E lên AK. a) chứng minh tam giác ABE cân b) gọi N là trung điểm BE . Tính góc AKN

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cho tam giác ABC vuông tại A ( AB < AC ) kẻ đường cao AK trên tia KC lấy điểm D sao cho KA =KD qu...
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