New
New
Year 2

Recognise and sort polygons

I can explain what a polygon is and sort polygons in different ways.

New
New
Year 2

Recognise and sort polygons

I can explain what a polygon is and sort polygons in different ways.

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Lesson details

Key learning points

  1. A polygon has straight sides.
  2. The sides of a polygon meet at vertices.
  3. A polygon is a 2D shape.
  4. Polygons can be sorted in different ways.
  5. Properties of polygons include the number of sides and the number of vertices.

Common misconception

Some children might not count the sides or vertices accurately because they lose track of where they started counting.

Ask children how they can make sure they only count each side or vertex once. Model marking each side or vertex as you count it.

Keywords

  • Polygon - A 2D shape made up of 3 or more straight sides.

  • 2D / two dimensional - A shape with only two measurable dimensions, e.g. width and length, but no thickness.

  • Sides - The outside edges of a shape.

  • Vertices - A vertex is the point where two lines meet. The plural is vertices.

Provide opportunities for children to handle and explore cut-outs of a wide range of polygons. Include examples with all sides and vertices the same, with some sides and vertices the same and some different and with all sides and vertices different.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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6 Questions

Q1.
Which of the shapes is the same as shape b?
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q2.
Match the correct name to each shape.
An image in a quiz
Correct Answer:a,rectangle

rectangle

Correct Answer:b,circle

circle

Correct Answer:c,triangle

triangle

Q3.
How can you describe each shape? Match the shape to the description.
An image in a quiz
Correct Answer:a,has four straight sides and four vertices

has four straight sides and four vertices

Correct Answer:b,has one curved line

has one curved line

Correct Answer:c,has thee straight sides and three vertices

has thee straight sides and three vertices

Q4.
True or false. These shapes are all rectangles.
An image in a quiz
Correct answer: True
False
Q5.
True or false. A square is a type of rectangle.
An image in a quiz
Correct answer: True
False
Q6.
All of these shapes are .
An image in a quiz
circles
squares
Correct answer: triangles
rectangles

6 Questions

Q1.
These shapes are all polygons. Which of the statements are true for all polygons?
An image in a quiz
Correct answer: They have three or more straight sides.
Correct answer: They are 2D shapes.
They are 3D shapes.
Correct answer: They have sides that join at vertices.
Q2.
Which of these shapes are not polygons?
An image in a quiz
Correct answer: a
b
Correct answer: c
Q3.
True or false. This shape is a polygon.
An image in a quiz
True
Correct answer: False
Q4.
Which of these polygons have five sides?
a
Correct answer: b
Correct answer: c
d
Q5.
This polygon has sides.
An image in a quiz
Correct Answer: 8, eight
Q6.
How have these shapes been sorted?
An image in a quiz
Shapes in a) are polygons and shapes in b are not polygons.
Shapes in a) are 2D shapes and shapes in b are 3D shapes.
Correct answer: Shapes in a) have more than 6 vertices and shapes in b) have less than 6