Mathematics, 07.09.2021 02:10 tansebas1107

Cho tam giác ABC vuông tại A có C=30° Đường cao AH lấy D thuộc HC Sao cho HD=HB . Qua C kẻ CE vuông góc với AD. a, Chứng minh rằng: tam giác ABH= tam giác ADH. b, Chứng minh ABC đều. c, Chứng minh: AH= CE .d, Gọi I là giao điểm củ AH và CE. Chứng minh rằng ID⊥AC

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Cho tam giác ABC vuông tại A có C=30° Đường cao AH lấy D thuộc HC Sao cho HD=HB . Qua C kẻ CE vuông...

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