Question

In the given figure p and q are two parallel lines

Answer 1

first of all, we need to draw a line between to parallel lines. Such that it cuts ∠B.

let the line denoted by 'r'

firstly view p and r AB is transversal, ∠ABr=140°

secondly view q and r BC is transversal, ∠CBr=120°

∴reflex of ∠ABC=140°+120°=260°

∴inner angle of ∠ABC=360°-260°=100°