Angles which total 90 deg are complementary, 180 deg supplementary.
Well when I look for the meaning of supplement it says a supplement is something added to complete a thing.. and a complement is kind of like a supplement. so if you look at the internet and typed "complementary and supplementary angles" you will get it more.
Complements are angles which add up to 90 degrees with another angle and supplements are angles which add up to 180 degrees with another angle.
Like, the complement of 30 degrees would be 60 degrees (90-30) degrees
and its supplement would be 150 degrees (180-30) degrees.
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They are complements when they add to 90 degrees, making a right angle. For example 60 degrees and 30 degrees, or 23 degrees and 67 degrees.
18 degrees
90 - 30 = 60 degrees.