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Triangle Angle
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Triangle Angle
Sum Theorem
Triangle
Sum Theorem
Angles
of a Triangle
Angles of Triangles
Geometry
Triangle
Sum Theorem Worksheet
Theorems On
Triangles
How to Measure
Angles 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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