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Top suggestions for Sum Interior Angles Triangle
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Angle Sum
of a Triangle
Exterior
Angles Triangles
Interior Angles
Examples
Calculating Angles
in a Triangle
Sum of Triangle Angles
Proof Guided
What Is a Co-
Interior Angle
Interior Angles
of Polygons
Triangle Exterior Angle
Theorem
Finding Sum
of Angles
Exterior Angle
Property of a Triangle
4:07
Khan Academy
Skyloom (Dubbing)
Angles in a triangle sum to 180° proof
The sum of the interior angle measures of a triangle always adds up to 180;. We can draw a line parallel to the base of any triangle through its third vertex. Then we use transversals, vertical angles, and corresponding angles to rearrange those angle measures into a straight line, proving that they must add up to 180.
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