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Finding Angles of
a Triangle
How to Find
Angle of Triangle
Sum of Interior
Angles of a Triangle Is
Exterior Angle of
a Triangle
Types of Triangles
by Angles
Triangle Angle
Theorems
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Angle Sum of
a Triangle
Calculate Angles of
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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°.
Sep 23, 2011
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