Question

What is Line Pair axiom?

Answer 1

Heya friend,

I think you mean LINEAR PAIR AXIOM.

Here is your answer
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LINEAR PAIR AXIOM states that : "If a ray stands on a line, then the sum of the two adjacent angles so formed is 180○

It can be stated in reverse too
I.e., If the sum of 2 adjacent angles is 180○ , then a ray stands on a line ( that is, the non-Common arms form a line)

Hope it helps..