Question

maths , class 9, ex. 6.1,sum 4​

Answer 1

Step-by-step explanation:

e, if x + y = w + ⇒, then prove that AOB is a line.

NCERT Solutions for Class 9 Maths Chapter 6 Lines and Angles Ex 6.1 Q4

Solution:

Sum of all the angles at a point = 360°

∴ x + y + ⇒ + w = 360° or, (x + y) + (⇒ + w) = 360°

But (x + y) = (⇒ + w) [Given]

∴ (x + y) + (x + y) = 360° or,

2(x + y) = 360°

or, (x + y) = 360∘2 = 180°

∴ AOB is a straight line.