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Lines and Angles Cass 9 Maths Online solutions Takshila Learning aims to provide subject matters to its students anytime and anywhere without any time wastage. Takshila learning targets at providing the best subject matter designed for   Class 9th Maths   along with the  NCERT solutions  under the guidance of our expert team.  In this article, we will learn about the theorem based on the below axioms. Theorem 1. If a transversal intersects two lines such that a pair of interior angles on the same side of the transversal is supplementary, then the two lines are parallel. Theorem 1.2 Lines which are parallel to the same line are parallel to each other We will draw line  t  transversal for the lines  l,m,  and  n. It is already given to us that line  m  is parallel to the line  l  and line  n  is parallel to line  l So it implies <1=<2 and <1=<3 (using the corresponding angles axiom So <2=<3 As the < 2 and <3 are corresponding ang