Geometry Vocabulary

Front

What is the definition of supplementary angles?

Back

Angles that add up to 180°.

Front

What are collinear points?

Back

Points that lie on the same line.

Front

What symbol represents parallel lines?

Back

∥

Front

What is the definition of coplanar points?

Back

Points that lie in the same plane.

Front

What is the definition of complementary angles?

Back

Angles that add up to 90°.

Front

What is the definition of vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is the definition of a ray?

Back

A part of a line that has one endpoint and extends infinitely in one direction.

Front

What is the sum of angles in a triangle?

Back

180°.

Front

What is a right angle?

Back

An angle that measures 90°.