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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
8:20
Khan Academy
Sal Khan
Worked example: Triangle angles (diagram)
We have a right triangle that's split into several smaller right triangles. The angle measures in any triangle always add up to 180 degrees. By using this fact and looking at complementary (adding up to 90 degrees) and supplementary (adding up to 180 degrees) angles, we can find the missing angle measures in the triangles.
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