Further MathematicsTrigonometryWAEC
In triangle ABC, a = 7 cm, b = 5 cm and C = 60°. Find c.
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Answer: A. √39 cm
c² = 49 + 25 − 2 × 7 × 5 × cos 60° = 74 − 35 = 39.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.