In the given figure AOB is a simple line and OC is indicated on this :

In the given figure AOB is a simple line and OC is indicated on this. If a: b = 2: 1, then the value of a is
Ques. 93
(a) 80o
(b) 100o
(c) 120o
(d) 140o

Anurag Mishra Professor Asked on 10th February 2016 in Maths.
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  • 2 Answer(s)

    Answer: (c)  (c) 120o.

    Solution:-
    a: b = 2: 1              (Given)
    a/b = 2/1
    a = 2b ……………………. (1)

    As, we know that the sum of all angles to make on a straight is 180o.
    Then,  a + b =  180
    From equation (1),
    2b + b = 180
    3b = 180
    b = 180/3
    b = 60o

    Then, a = 2b => 2 x 60
    = 120o

    So, the value of a will be 120o.

    Hence, the correct answer is option (c) 120o.

    Anurag Mishra Professor Answered on 10th February 2016.
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    120°
    a:b=2:1
    total=2+1=3parts
    3parts=180° then 1part=180°/3=60°
    required a=2parts=>2*60=120°

    GANIAPL Newbie Answered on 11th February 2016.
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