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lethuyduyen005
2 năm trước
Bài 3: (2 đ) a) Cho tam giác ABC vuông tại A, biết AB = 9cm; BC = 15cm. Tính chu vi tam giác ABC ? b) Cho tam giác ABCcân tại A biết góc A 50 độ . Tính số đo góc B và góc C . Bài 1: ( 3 đ) Cho tam giác ABC có AB = 6 cm, AC = 8 cm, BC = 10 cm.. a) Chứng minh tam giác ABC vuông. b) Kẻ AH vuông góc với BC. Biết AH = 4,8cm. Tính độ dài các đoạn BH, CH.
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