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duyentran367
2 năm trước
Mọi người giúp mình với không cần vẽ hình nhé.Mình cảm ơn Bài tập 1: Cho tam giác ABC có AB = 5cm, AC = 12cm, BC = 13cm. Chứng tỏ tam giác ABC là tam giác vuông. Bài tập 2: Cho tam giác ABC cân tại A, tia phân giác góc A cắt BC tại D. a. Chứng minh DB = DC. b. Kẻ DH vuông AB (H thuộc AB), DK vuông AC (K thuộc AC). Chứng minh tam giác DHK cân. c. Chứng minh HK // BC.
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