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Today we will derive the sum of the interior angles for any triangle. All we need are the angle theorems (here the alternate angle theorem or vertex angle theorem and step angle theorem). And we should know that a circle has 360°. If you want to support the channel, then share, subscribe, comment and like the videos! 0:00 Introduction 0:09 What do we need? 0:40 Procedure 2:07 Derivation with alternate angles 3:06 Derivation with vertex angle + step angle #InteriorAngleSumTriangle #InteriorAngleSumTriangleDerivation