Common Core Math Vocabulary

2 Dimensional - Definition with Examples

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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. 

Two-dimensional 2-D shapes circle triangle square polygons

  Fun Facts

  • A point is zero-dimensional, while a line is one-dimensional, for we can only measure its length. 
 

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2-D shapes can be drawn flat on a plane,
Length and width are dimensions that are main!
 

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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.
 

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