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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