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      Describe, name and sort polygons, including pentagons, hexagons and octagons

      Lesson details

      Learning outcome

      I can recognise and describe polygons including pentagons, hexagons and octagons.

      Key learning points

      1. The names of polygons are linked to the number of sides they have.
      2. A pentagon is any polygon with 5 sides.
      3. A hexagon is any polygon with 6 sides.
      4. An octagon is any polygon with 8 sides.

      Keywords

      • Pentagon - A polygon with 5 sides and 5 vertices.

      • Hexagon - A polygon with 6 sides and 6 vertices.

      • Octagon - A polygon with 8 sides and 8 vertices.

      Common misconception

      Children may say that they do not know the name of a polygon when it is an irregular and it does not look familiar to them.

      Show children a wide range of pentagons and count the sides and vertices of each shape. Agree that these shapes are all pentagons even though they all look different. Repeat with hexagons and octagons.

      Teacher tip

      Allow children plenty of practice of marking each side or vertex as they count. Ask children if it matters which side or vertex you count first? Why do they think this?

      Licence

      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Triangles have straight sides and vertices.

      Correct Answer: 3, three

      Q2.
      Match the start and ends of the statements correctly.

      Correct Answer:tri means,three
      Correct Answer:quad means ,four

      Q3.
      Squares and rectangles are types of .

      triangles
      Correct answer: quadrilaterals
      3D shapes

      Q4.
      Which of these shapes is different to the other shapes?

      a
      b
      Correct answer: c
      d

      Q5.
      Match the correct label to each set of shapes.

      An image in a quiz
      Correct Answer:Set A,not triangles
      Correct Answer:Set B,triangles

      Q6.
      Here is a set of labelled rectangles. Which shape should not be in this set?

      An image in a quiz
      Correct answer: a
      b
      c
      d

      6 Questions

      Q1.
      Which of these polygons have six sides?

      Correct Answer: An image in a quiz
      An image in a quiz
      Correct Answer: An image in a quiz
      An image in a quiz
      An image in a quiz
      Correct Answer: An image in a quiz
      An image in a quiz

      Q2.
      Match the polygons to their properties.

      An image in a quiz
      Correct Answer:a,has 5 vertices
      Correct Answer:b,has 8 sides
      Correct Answer:c,is a quadrilateral
      Correct Answer:d,is a triangle

      Q3.
      Match the polygon to its name.

      An image in a quiz
      Correct Answer:a,octagon
      Correct Answer:b,pentagon
      Correct Answer:c,hexagon

      Q4.
      Match the polygon to its properties.

      Correct Answer:An octagon is,a polygon with 8 sides and 8 vertices.
      Correct Answer:A hexagon is,a polygon with 6 sides and 6 vertices.
      Correct Answer:A pentagon is,a polygon with 5 sides and 5 vertices.

      Q5.
      Which set of polygons has an incorrect shape?

      An image in a quiz
      hexagon
      Correct answer: octagon

      Q6.
      Order the shapes by the number of vertices, starting with the fewest.

      1 - quadrilateral
      2 - pentagon
      3 - hexagon
      4 - octagon

      To help you plan your 2 maths lesson on: Describe, name and sort polygons, including pentagons, hexagons and octagons, download all teaching resources for free and adapt to suit your pupils' needs...