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Did you think that you had already learned the names of all the angles? Ha! Here are some more! 

complementary angles: two angles whose sum is 90°. In these two angles, if you add the angle measures, you find that 25° + 65° = 90° so these angles are complementary angles. 

supplementary angles: two angles whose sum is 180°. In these two angles, if you add the angle measures, you find that 50° + 130° = 180° so these angles are complementary angles. 

straight angle: an angle that measures exactly 180°. 

Let's see…let's take a look at some angles to see if we 'get' the concept, okay? Here's a bunch of angles with their measures. Let's see if we can understand Complementary and Supplementary angles based on the definitions above. 

Now, are you ready for the NEXT type of angles? Next page… 
