Angles can be complementary. A 100 degree angle is a complementary angle to an 80 degree angle in geometry studies.
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The phrase "complementary line" usually has to do with business. Example: I have a complementary line of famous products that I am trying to sell to you". Mostly just used in advertising. Most likely, you are asking what a "complementary angle" is? Two complementary angles will always add up to 90 degrees (pi/4). So, if 30 degrees is the starting angle, 60 degrees would be the complementary angle.
they are events that can't occur at the same time. For example, you toss a coin you get head or tails. These are complementary events since you can't have both at the same time, only one!
complementary angles are two angles whose total degrees adds up to 90o supplementary angles are two angles whose total degrees adds up to 180o
Two colours are complementary if lights of those colours add to make pure white light. Complementary colours are not the same as complementary pigments (or paints).
No only two angles can be complementary