Mọi người điền ABCD hộ nha Chuyên đề: Các hệ thức lượng trong tam giác câu1 Cho tam giác ABC có AB = 8 cm, AC = 18 cm và có diện tích bằng 64 cm Giá trị sin 4 là: a. 3/2 b.4/5 c. 3/8 d.8/9 Câu 2. Cho tam giác ABC có AB = 4 cm, BC = 7 cm, CA = 9 cm. Giá trị cos 4 là: a. 2/3 c. -2/3 b. 1/3 d. 1/2 Câu 3. Cho tam giác ABC có AB =5, AC = 8, 4= 60°. Kết quả nào trong các kết quả sau là độ dài cạnh BC? A. V129 B.7. C.49. D. 169 Câu 4. Tam giác ABC có a=14, b=18, c= 20, Kết quả nào sau đây là gần đúng nhất? A. B = 42°50' B.B = 60°56'. C.- 119°04'. D.ÊN 90° Câu 5. Nếu tam giác MNP có MP =5, PN =8 và MIN =120° thi độ dài cạnh MN (làm tròn đến chữ số thập phân thứ nhất) là: A.11,4 B.12,4 C.7,0 D.12,0

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