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    In the given figure is a simple line and is incident on this. If a : b = 2 : 1, then the value of a is –
    Question

    In the given figure is a simple line and is incident on this. If a : b = 2 : 1, then the value of a is –

    A.

    80°

    B.

    100°

    C.

    120°

    D.

    140°

    Correct option is C

    Given, a : b = 2 : 1 

    let a = 2x and b = x 

    2x + x  = 180°

    3x = 180°

    x = 60°

    Now, a = 2 x 60° = 120° 

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