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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.

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Q: What is a complementary line?
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