Common Core Math Vocabulary

# 2 Dimensional - Definition with Examples

**What is a two-dimensional shape? **

In geometry, a two-dimensional shape can be defined as a flat plane figure or a shape that has two dimensions – length and width.

Two-dimensional or 2-D shapes do not have any thickness and can be measured in only two faces.

We can classify figures on the basis of the dimensions they have.

A circle, triangle, square, rectangle and pentagon are examples of two-dimensional shapes.

## Let's sing!

*2-D shapes can be drawn flat on a plane,*

*Length and width are dimensions that are main!*

## Let's do it!

Instead of handing out colouring 2D shapes worksheets, show you child pictures of two-dimensional and three- dimensional shapes. Ask them to identify each as two- and three- dimensional and justify their answers.

## Related math vocabulary

The Complete K-5 Math Learning Program Built for Your Child