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    Question

    In a triangle ABC, AB = 13 cm, BC = 14 cm, and AC = 15

    cm. Find the area of the triangle and the length of the altitude from vertex A to side BC.
    A Area = 84 cm┬▓, Altitude = 12 cm Correct Answer Incorrect Answer
    B Area = 84 cm┬▓, Altitude = 13 cm Correct Answer Incorrect Answer
    C Area = 90 cm┬▓, Altitude = 12 cm Correct Answer Incorrect Answer
    D Area = 90 cm┬▓, Altitude = 13 cm Correct Answer Incorrect Answer

    Solution

    Using HeronтАЩs formula, s = (AB + BC + AC) / 2 = (13 + 14 + 15) / 2 = 21 cm. Area = тИЪ[s(s - AB)(s - BC)(s - AC)] = тИЪ[21(21 - 13)(21 - 14)(21 - 15)] = тИЪ[21 ├Ч 8 ├Ч 7 ├Ч 6] = тИЪ(7056) = 84 cm┬▓. Altitude from A = (2 ├Ч Area) / BC = (2 ├Ч 84) / 14 = 12 cm. Correct Option: a) Area = 84 cm┬▓, Altitude = 12 cm

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