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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.

Q: When are two angles called complements of one another?

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In geometry and mathematics, opposing angles are called verticals. They share the same vertex, but they still are vertically opposite of one another.

Complements or complementary events

Adjacent angles

Vertically opposite angles!

Adjacent angles are simply two angles that are next to one another and share one side. There is nothing else unique about these angles, and they are measured as one would measure any other angles.

Related questions

I assume you are asking what such angles are called. The answer is, vertical angles.

In geometry and mathematics, opposing angles are called verticals. They share the same vertex, but they still are vertically opposite of one another.

The word "complements" refers to the suitability of one thing with another. "Compliments", however, are positive comments made by one person to another, usually concerning someones clothes or cooking.

A decrease in the price of one will increase the demand for the other.

products that increase the value of other products / products related in such a way that an increase in the price of one reduces the demand for bolth (found in economics principles & practices from the Texas edition book)

They are said to be perpendicular. Or, if you wanted an example of a pair of such lines, one example is a plus sign.

Two lines are crossed by one another line called the transversal. The pairs of angles on opposite sides of the transversal but inside the two lines are called alternative interior angles.

Price of related goods fall into two categories: substitutes and complements. Complements are when a price decrease in one good increases the demand of another good. Substitutes are when a price decrease in one good decreases the demand for another good.

Complements or complementary events

Adjacent angles

Next to one another

Vertically opposite angles!