Proof of the Sum of Angles of a Triangle Measure 180 Degrees | Don't Memorise

A massive topic, and by far, the most important in Geometry. We will prove in this video, why sum of all angles of a Triangle is 180 degrees.

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In this video, we will learn:
0:00 Proof of Sum of Angles of a Triangle Measure 180 Degrees
0:59 alternate interior angles

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Видео Proof of the Sum of Angles of a Triangle Measure 180 Degrees | Don't Memorise канала Don't Memorise