Geometry Vocab

Front

What is a Line?

Back

A straight one-dimensional figure that has no thickness and extends infinitely in both directions.

Front

Define a Segment.

Back

A part of a line that is bounded by two distinct endpoints.

Front

What is a Ray?

Back

Has one initial point and continues in one direction indefinitely.

Front

What is a Plane?

Back

A flat surface that is made up of points that goes on indefinitely.

Front

How many endpoints does an angle have?

Back

One.

Front

What is the definition of an Angle?

Back

A figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex.

Front

What is a Vertex?

Back

The common endpoint of the rays that form an angle.

Front

What is a Complementary Angle?

Back

Two angles whose measures add up to 90 degrees.

Front

What is a Supplementary Angle?

Back

Two angles whose measures add up to 180 degrees.

Front

What is a Right Angle?

Back

An angle that measures exactly 90 degrees.