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    4. Geometry
    5. In ∆ABC, AB = 5cm, BC = 10cm, and AC = 13cm then find out the value of cos A.

    Question

    In ∆ABC, AB = 5cm, BC = 10cm, and AC = 13cm then find

    out the value of cos A.
    A 47/65 Correct Answer Incorrect Answer
    B 43/61 Correct Answer Incorrect Answer
    C 13/35 Correct Answer Incorrect Answer
    D 89/100 Correct Answer Incorrect Answer

    Solution

    From the Cosine rule, we get. BC2 = AC2 + AB2 - 2AC.AB.cos A 100=25+169-2×5×13×Cos A 130CosA=194-100=94 cos A = 94/130 =47/65

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