Basic Geometry Vocabulary

Front

What is a point in geometry?

Back

A location in space that is represented by a dot and has no dimensions.

Front

What is a line in geometry?

Back

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

Front

What is a plane in geometry?

Back

A flat two-dimensional surface that extends infinitely in all directions.

Front

What is a line segment?

Back

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

Front

What is a ray in geometry?

Back

A part of a line that starts at a point and extends infinitely in one direction.

Front

What is an angle?

Back

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

Front

What is the notation for a point?

Back

Typically represented by a capital letter, e.g., Point A.

Front

What is the notation for a line?

Back

Usually represented by two points on the line, e.g., line AB.

Front

What is the notation for a line segment?

Back

Represented by the endpoints, e.g., segment AB.

Front

What is the notation for a ray?

Back

Represented by its endpoint and another point on the ray, e.g., ray AB.