Check sibling questions

Let us consider a triangle ∆ ABC


Let ∠ 1 be the exterior angle



Since BAD is a line

  ∠ A + ∠1 = 180°      (Linear Pair)

  ∠ 1 = 180° − ∠ A


So, in a polygon

  Interior angle + Exterior angle = 180°

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.