Question

The angles of linear pair of angle are in ratio of 2 : 7 , then the greater angle is
a) 20º
b) 40º
c) 70º
d) 140º​

Answer 1

Answer:

ANSWER

Let the angles be 2x and 7x

Angles are given supplementary

2x+7x=180

∘

9x=180

∘

x=20

∘

So the angles are 2×20

∘

=40

∘

and 7×20

∘

=140

∘

Answer 2

if linear pair are in straight line

then

let the angle be 2x & 7x.

As straight line make angle of 180°

sum of them will 180°

therefore,. 2x + 7x = 180°

therefore , x=20°

therefore

$7 \times 20 = 140$

therefore d.] option is correct.

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