EM-1355
Cosine rule
E Math · Secondary 3 · Medium · Cosine rule
In triangle ABC, AB = 7 cm, AC = 10 cm and angle BAC = 40°. Find the length of BC, correct to 3 significant figures. (Use the cosine rule.)
- 6.46 cm
- 8.52 cm
- 11.9 cm
- 5.24 cm
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