Sum Of All Angles of a Triangle is 180 degrees (proof)
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YouTubeTinyMaths
Sum Of All Angles of a Triangle is 180 degrees (proof)
In this lesson we will give proof that the sum of the interior angles of a triangle is 180 degrees. This proof is necessary because from the knowledge that the sum of all angles in a triangle is 180 degrees, we can then use triangles and their angle measurements to calculate all other types of polygons, whether they be squares, quadrilaterals ...
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