The slides are comprehensively linked to associated pedagogical guidance in the NCETM Primary Mastery Professional Development materials. There are also links to the ready-to-progress criteria detailed in the DfE Primary Mathematics Guidance 2020.

### Learning outcomes

# | Title |
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1 | A regular polygon has sides that are all the same length and interior angles that are all equal in size |

2 | Perimeter is the distance around the edge of a two-dimensional shape |

3 | Different shapes can have the same perimeter |

4 | Perimeter is measured in units of length and can be found by counting units |

5 | Perimeter can be calculated by adding together the side lengths of a 2D shape |

6 | The perimeter of a rectangle can be calculated by addition and multiplication |

7 | Unknown side lengths can be calculated from perimeter and known side lengths |

8 | The perimeter of a regular polygon can be calculated by multiplication |

9 | The side length of a regular polygon can be calculated by division where the perimeter is known |