GIF related to Linear Pair angles -NCERT mathematics 9th Standard

Axiom 6.2:

                 If the sum of two adjacent angles is 180°, then the non-common

      Arms of angles form a line.

Axiom 6.1:

              If a ray stands on a line, then the sum of two adjacent angles so formed is 180°.

            ∠ABD + ∠DBC =∠ABC