Làm giúp mk bài ngắn này với sáng mai là mk phải nộp r hứa vote và câu tlhn có mỗi câu ngắn này thôi Cho đường tròn (O;R) có 2 đường kính vuông góc là AB và CD , lấy K thuộc cung nhỏ AC, kẻ KH vuông góc với AB tại H . Nối AC cắt HK tại I, tia BC cắt đường thẳng HK tại E , nối AE cắt đường tròn (O;R) tại F a) chứng minh BHFE là tứ giác nội tiếp b ) chứng minh EC. EB = EF . EA

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