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    Question

    The angle of elevation of the top of a tower at a point

    on level ground is 45Β°. When moved 20 m towards the tower, the angle of elevation becomes 60Β°. What is the height of the tower?
    A 10(3β€“βˆšβˆ’1)10(3βˆ’1) m Correct Answer Incorrect Answer
    B 10(3β€“βˆš+1)10(3+1) m Correct Answer Incorrect Answer
    C 10(3βˆ’3β€“βˆš)10(3βˆ’3) m Correct Answer Incorrect Answer
    D 10(3+3β€“βˆš)10(3+3) m Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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