This video gives us a walkthrough of the proof that the angle measures of the angles of a triangle add up to 180. This proof requires us to draw in a line on our own (specifically, one that is parallel to one side of the triangle, but it could be any side). Then we can treat the two non-parallel sides as transversals.
Proving the Sum of Measures of Angles in a Triangle are 180 is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSG.CO.C.10.
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1. HSG.CO.C.10 : Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point..
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