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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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