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    Question

    The area of a triangle is 216 cm² and the ratio of its

    sides is 9: 12: 15. What is the perimeter of the triangle?
    A 35cm Correct Answer Incorrect Answer
    B 48cm Correct Answer Incorrect Answer
    C 72cm Correct Answer Incorrect Answer
    D 65cm Correct Answer Incorrect Answer

    Solution

    Given ratio of sides, form a triplet of a right-angle triangle.   =1/2 × 9x × 12x = 21 54x2 =216   x² = 4   x = 2 Perimeter = (9 + 12 + 15) × 2 = 72 cm.

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