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    Question

    In ∆ABC, AB = 5cm, BC = 6cm and AC = 10cm then find

    out the value of cos A?
    A 73/100 Correct Answer Incorrect Answer
    B 65/100 Correct Answer Incorrect Answer
    C 89/100 Correct Answer Incorrect Answer
    D 92/100 Correct Answer Incorrect Answer

    Solution

    From Cosine rule, we get BC2 = AB2 + AC2 - 2AB.AC.cos A 36=25+100-2×5×10×Cos A 100CosA=125-36=89 cos A = 89/100 .

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