![]() ![]() So complementary angles could be angles 1 and 2. Here we have five angles 1, 2, 3, 4 and 5 and we're told that this angle 3 is 90 degrees, now one thing that you can assume is that 1, 2 and 3 are all linear, so if you add up 1, 2 and 3 it would be 180 degrees, which means that 1 and 2 must also sum to 90 degrees so I could label this as a right-angle. ![]() Let's look at a specific example where you might be asked to identify supplementary angles and complementary angles. The same is true for complementary angles. But I could also say if we had some angle here that we said three and let's say 3 was equal to 60 degrees and I had some other angle over here, let's say angle four was equal to 120 degrees, I could say that these two angles three and four are supplementary because they sum to 180 degrees. ![]() So supplementary angles could be adjacent so if I had angles one and two those two would be supplementary. And I noted here that these do not have to be adjacent. Supplementary angles are two angles whose measures sum to a 180 degrees and complementary are the sum have to add up to 90 degrees. Two concepts that are related but not the same are supplementary angles and complementary angles. ![]()
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