Understand that different shapes can have the same perimeter
Lesson details
Learning outcome
I understand that different 2D shapes can have the same perimeter.
Key learning points
- Shapes that look different can have the same perimeter.
- You can draw or create more than one 2D shape with the same perimeter.
- Shapes with different numbers of sides can have the same perimeter.
Keywords
Polygon - A polygon is a 2D shape made up of 3 or more straight lines.
Perimeter - The distance around a two-dimensional shape.
Common misconception
Pupils will most likely understand that different shapes can and most often do have different perimeters. They may not realise that the perimeters can potentially be the same.
Allowing pupils to recreate perimeters using string or number rods and rearranging themselves to make a new shape is a powerful way of showing that different shapes can have equal perimeters.
Teacher tip
If it is possible for the pupils to use real leaves, it will make the learning experience even more enjoyable and memorable. However, pictures of leaves are an acceptable substitute.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Match the number of sides to the shape name.
triangle
quadrilateral
pentagon
hexagon
Q2.Select all of the names of shapes that are polygons.
Q3.Which of these shapes are regular polygons?
Q4.Rearrange these phrases to make a sentence.
Q5.Which of these shows the perimeter of the triangle?
Q6.In terms of perimeter, which of the statements are true of this image?
Assessment exit quiz
6 Questions
Q1.Which of these is true?
Q2.Always, sometimes or never true? A regular polygon can have the same perimeter as a shape with curved sides.
Q3.Select the two shapes with the same perimeter.
Q4.Which of these statements is true?
Q5.Which statement is true of the polygons created inside these number rods?
Q6.Which of these statements is true about these three rectangles?
To help you plan your 4 maths lesson on: Understand that different shapes can have the same perimeter, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Understand that different shapes can have the same perimeter, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Perimeter unit, dive into the full primary maths curriculum, or learn more about lesson planning.