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    Question

    A vertical flagstaff stands on a horizontal plane. From

    a point distant 210 metres from its foot, the angle of elevation of its top is found to be 30°. Find the height of the flagstaff.
    A 40√3 m Correct Answer Incorrect Answer
    B 50√3 m Correct Answer Incorrect Answer
    C 60√3 m Correct Answer Incorrect Answer
    D 70√3 m Correct Answer Incorrect Answer

    Solution

    tan 30° = H/210 1/ 1/√3 = H/210 H = 210/ √3 ×  √3/√3 = √3 × 210/3 = 70√3 m  

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