Milestones Math Vocabulary 3rd grade

Shapes that are the same size and shape:

• the same

• congruent

• similar

• polygons

Figures that have the same shape but may be different sizes.

• congruent

• teepees

• similar figures

• shapes

An angle that measures less than 90 degrees.

• obtuse

• similar

• right

• acute

An angle that measures greater than 90 degrees but less than 180 degrees.

• acute

• right

• obtuse

An angle that measures 90 degrees.

• right

• left

• acute

• obtuse

A figure formed by two rays that meet at a common endpoint.

• angle

• line

• ray

• point

A straight path extending in both directions with no endpoints.

• ray

• line

• point

• angle

Part of a line with two endpoints

• ray

• endpoint

• line segment

• angle

Part of a line that begins at one endpoint and extends forever in one directions.

• point

• line

• segment

• ray

The name of a location on an object.

• ray

• angle

• point

• figure