Multiple Choice Questions on ABCD is a parallelogram with AB and AD as adjacent sides If ang A 60 deg and AB 2AD then the diagona........... for CDS Exam Preparation

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Multiple Choice Questions

ABCD is a parallelogram with AB and AD as adjacent sides If ang A 60 deg and AB 2AD then the diagona...........

Quantitative Aptitude (CDS) Mensuration 2D
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    ABCD is a parallelogram with AB and AD as adjacent sides. If ∠A = 60° and AB = 2AD, then the diagonal BD will be equal to

    √2 AD

    Incorrect Answer

    √3 AD

    Correct Answer

    2AD

    Incorrect Answer

    3AD

    Incorrect Answer
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    Explanation:

    AB = 2AD and ∠A = 60°
    In ΔABD

    BD2=AB2+AD2−2×AB×ADcos60°
    =(2AD)2+AD2−2×2AD×AD×1/2=3AD2

    ⇒BD=√3AD

    By: Munesh Kumari
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