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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.
Sep 23, 2011
Triangle Angle Theorems
Triangle Sum Theorem – Explanation & Examples
storyofmathematics.com
Feb 20, 2023
4:28
Angles in a triangle sum to 180° proof
Khan Academy
Sal Khan
Sep 23, 2011
Angles of a Triangle – Explanation & Examples
storyofmathematics.com
Feb 20, 2023
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