Common Core Math Vocabulary

Side - Definition with Examples

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What is a side? 
In geometry, side can be defined as the line segment that joins two vertices in a shape or two-dimensional figure.

Here, for instance, the rectangle has four sides.

Sides Geometry Two-Dimensional 2D shape

  Fun Facts

  • A side of two-dimensional shape, is called an edge in three-dimensional shape.

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All two-dimensional shapes have a side.
Some have three, and some have five.
You can name them all by their sides!

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Show you child pictures of different two-dimensional shapes. Ask them to count the number of shapes they have and tell them its name. You can further explain how these shapes have been named basis the number of sides they have. 

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