New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A pole 10 m long rests slantly against a vertical wall

    AB making an angle 30° with the horizontal (ground). Find how far the foot of the pole is from the wall (in metres). 
    A 15 Correct Answer Incorrect Answer
    B 5/√3 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 5√3 Correct Answer Incorrect Answer

    Solution

    A pole 10 m long makes an angle of 30° with the horizontal ground. Using the cosine formula: cos 30° = x/10 x = 10.cos 30° = 10 x √ 3/2 = 5√3 m

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