Why does the interior angle measures of a triangle equal 180 degrees?

Описание к видео Why does the interior angle measures of a triangle equal 180 degrees?

The interior angle measure of all triangles equals 180 degrees. Why?
In this video, I show you why. You start with a circle, draw a diameter which equals 180 degrees. Next, draw two parallel lines which create transversal and angles that are equal.

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