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    Question

    If the altitude of an equilateral triangle is 9 cm, then

    find out its area?
    A 25тИЪ3 Correct Answer Incorrect Answer
    B 27тИЪ3 Correct Answer Incorrect Answer
    C 18тИЪ3 Correct Answer Incorrect Answer
    D 24тИЪ3 Correct Answer Incorrect Answer

    Solution

    Altitude of equilateral triangle = 9 cm √3/2 × side = altitude side = (9×2)/√3 = 6√3 cm Area of equilateral triangle = √3/4 × side² = √3/4 × 6√3 × 6√3 = 27√3 cm²

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