MathematicsTrigonometryJAMB
In triangle ABC, a = 7 cm, b = 5 cm and angle C = 60°. Find c.
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Answer: C. √39 cm
Cosine rule: c² = 49 + 25 − 2(7)(5)cos 60° = 74 − 35 = 39, so c = √39 cm.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.