1) Cho tam giác ABC có AB = 5cm, AC = 12cm, BC = 13cm. a) Tam giác ABC là tam giác gì? Vì sao? b) So sánh các góc của tam giác ABC. 2) Cho tam giác ABC, biết a) So sánh các cạnh của tam giác b) Tia phân giác của góc A cắt BC ở D. So sánh độ dài các đoạn BD và CD.

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