Count the Sides of 2D Shapes

2D (two dimensional) shapes are flat and can only be drawn on paper.

 

For the 2D shapes, we should know how many sides they have. A side is a line that joins up two corners of the shape. For example, a triangle always has three sides.

 

 

Let's have a look at how many sides different 2D shapes have. 

 

One side:

Here, we have a circle and an oval. They just have one curved side.

 

    

 

Three sides: 

For three-sided shapes we have triangles.

 

     

 

Four sides:

There are lots of four-sided shapes. We have a square, where all the sides are the same length. 

 

  

 

There is a rectangle. In a rectangle, the opposite sides are the same length and the sides touching are different lengths: 

 

   

 

We also have a kite and a rhombus that have four sides.

We can recognise a kite as it looks like the kite that we fly! 

 

  

 

A rhombus looks like a diamond:

 

  

 

Five sides:

A shape with five sides is called a pentagon.

 

  

 

Six sides:

A shape with six sides is called a hexagon.

 

  

 

Eight sides:

A shape with eight sides is called an octagon.

 

  

 

We are going to answer questions on the number of sides on these 2D shapes. 

 

Shall we get started?