23rwilliamson
07.09.2021 •
Mathematics
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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