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trangrealpcy
2 năm trước
Cho tam giác ABC vuông tại A có B= 60 độ. Vẽ AH vuông góc với BC tại H a) tính HAC b) trên cạnh ÁC lấy D sao cho AD = AH, qua D kẻ đg thẳng vg với AC , cắt tia AH tại E, chứng minh ED // BA c) gọi I là trung điểm của HD. Tia AI cắt HC tại K , chứng minh HK = KD ( ko dùng tạm giác cân)
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