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trungthai842st
2 năm trước
Cho tam giác ABC . Trên tia đối của tia BC lấy điểm D sao cho BD= AB. Trên tia đối của tia CD lấy điểm E sao cho CE=AC.Gọi H là chân đường vuông góc kẻ từ D đến AD , K là chân đường vuông góc kẻ từ C đến AE a) Chứng minh HK//DE b) Tính HK, biết chu vi tam giác ABC=10 Giúp mình vs mình cần gấp ( lưu ý : em ms học từ bài đối xứng trục trở xuống thôi ạ )
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