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Sum of Interior Angles of a Triangle
Is
Exterior
Angle of a Triangle
Sum of Triangle Angles
Proof Guided
Triangle Angle
Theorems
How to Find the
Interior Angle of a Triangle
Interior Angles of a Triangle
Examples Right Triangle
How to Calculate the
Angle of a Triangle
4:28
Khan Academy
Sal Khan
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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