Complementary & supplementary angles (Full video)

Khan Academy

Supporting grades: 7

Description: Learn about complementary and supplementary angles, as well as the definitions of adjacent and straight angles. Created by Sal Khan. Let's say I have an angle ABC, and it looks something like this. And then also let's say that we have another angle called DBA. And let's say that we know that the measure of angle DBA is equal to 40 degrees.

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