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.
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Supplementary angles forms a 180o angle (or a straight line). Complementary angles form a 90o angle.
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
Angles can be complementary. A 100 degree angle is a complementary angle to an 80 degree angle in geometry studies.
Complementary angles are those that add up to 90. Therefore, the complementary angle of 90 is 0.