complementary angle

American  

noun

Mathematics.

1. either of two angles that added together produce an angle of 90°.

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complementary angle British  

noun

1. either of two angles whose sum is 90° Compare supplementary angle

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Example Sentences

“Co” means taking the same function but with the complementary angle.

From Scientific American

For instance, the cosine of an angle is also the sine of the complementary angle.

From Scientific American

Likewise, the coversine is the versine of the complementary angle, as you can see in light blue above one of the red sines in the diagram at the top of the post.

From Scientific American

If the “co” in that definition meant the complementary angle, then vercosine would be the same as coversine, which it isn’t.

From Scientific American

It had all the essential elements: * something tangible in the every day sphere in which to frame the abstract physics; * a fun pop culture tie-in with a classic film clip; and * a news hook, in the form of a new paper about to be published in Physical Review Letters — two papers, actually, since another group of scientists independently arrived at similar conclusions from a complementary angle.

From Scientific American