Geometry Vocab - 3rd-5th grade

Front

What is a line segment?

Back

Part of a line with 2 endpoints.

Front

What is a ray?

Back

Part of a line that has 1 endpoint and extends infinitely in one direction.

Front

What is a line?

Back

A straight path that extends infinitely in both directions.

Front

What is a point?

Back

A specific location in space with no size or dimension.

Front

What is an angle?

Back

Formed by two rays that share a common endpoint.

Front

What are acute angles?

Back

Angles that are less than 90 degrees.

Front

What are right angles?

Back

Angles that are exactly 90 degrees.

Front

What are obtuse angles?

Back

Angles that are greater than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that is exactly 180 degrees.

Front

What is a polygon?

Back

A closed figure formed by three or more line segments.