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MSS1/L1.8:Work out the perimeter of simple shapes, e.g. rectangle, equilateral triangle

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Skills, knowledge & understanding

Work out the perimeter of simple shapes, e.g. rectangle, equilateral triangle

  • Know that perimeter is the boundary of a shape
  • Know that perimeter is measured in units of length
  • Understand that the measurements required to calculate the length of the perimeter depend on the shape

Activities & examples

SfL curriculum activites

  • Discuss the meaning of perimeter and its use in practical contexts.
  • Find the perimeter of shapes in different ways, e.g. for large shapes such as a room or garden use pacing, a trundle wheel, metre stick or measuring tape; for smaller shapes use a piece of string, a 30cm or metre rule.
  • Discuss ways of finding the perimeter of a rectangular shape – (by measuring two sides) and derive a simple formula in words. Use the formula to check the perimeters of some of the shapes that have been found previously.
  • Investigate simple shapes with the same perimeter (e.g. a rectangle and a square), or rectangles with the same area but different perimeters.

Ideas & suggestions

Resources

Useful links

Other curriculum elements

The following elements may also be useful:

Resources on other websites

The resources below are on external websites.