Q: What term applies to any angle two angles that have a sum of 180 degrees?

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Two angles that have a sum of 90 degrees are called complementary angles.

Two angles that add to 90 degrees are called complementary.

Verticle

They are said to be complementary angles that add up to 90 degrees

The term supplementary angle is used to refer to angles whose sum is 180 degrees. This is different from complementary angles which add up to 90 degrees.

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They are complementary angles that add up to 90 degrees

They are said to be complementary angles that add up to 90 degrees

Two angles that have a sum of 90 degrees are called complementary angles.

Two angles that add to 90 degrees are called complementary.

Verticle

a straight line

They are said to be complementary angles that add up to 90 degrees

The term supplementary angle is used to refer to angles whose sum is 180 degrees. This is different from complementary angles which add up to 90 degrees.

If two angles add up to 90 degrees, a right angle that is known as a Complementary Angle. The angles do not have to meet to be considered a Complementary Angle. This is a term that is used in math.

If 2 angles add up to 180 degrees, they're called supplementary angles and one of the pair is said to be the supplementary angle for the other. Similarly, for 90 degrees, the term used is complementary.

An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. In addition there are concave octahedra. Some of these will have no obtuse angles, others will have several.

There is no term to calculate any angle of any irregular polygon. For a regular polygon with n sides, each exterior angle is 360/n degrees. Each interior angle is (180 - exterior angle).