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    Question

    In triangle ABC, if a = 8 cm, b = 6 cm, and angle C =

    60┬░, find the length of side c.
    A 10 cm Correct Answer Incorrect Answer
    B 9 cm Correct Answer Incorrect Answer
    C 8 cm Correct Answer Incorrect Answer
    D 7.2 cm Correct Answer Incorrect Answer

    Solution

    Using the Law of Cosines: c┬▓ = a┬▓ + b┬▓ - 2ab cos(C) c┬▓ = 8┬▓ + 6┬▓ - 2(8)(6)(1/2) c┬▓ = 64 + 36 - 48 c┬▓ = 52 c = тИЪ52 тЙИ 7.2 cm.

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