Mathematics·Measurement·procedural
Perimeters of polygons
Solve problems involving perimeters of polygons: find perimeter from side lengths, find an unknown side length, and explore rectangles with same perimeter but different areas (or vice versa)
Suggested ages 8–9
Learning journey
Your child is learning to measure the world around them — calculating areas and perimeters, converting between different units like metres and kilometres, and solving time problems using both analogue and digital clocks.
Evidence of understanding
- Calculate the perimeter of a rectangle with sides 8 cm and 5 cm
- Find the missing side of a pentagon with perimeter 30 cm and four known sides
- Draw two rectangles both with perimeter 24 cm but different areas
Assessment prompt
If a rectangle has a perimeter of 24 cm and one side is 8 cm, can Perimeters of polygons work out the length of the other side — without drawing it?
Standards alignment
No external standards are linked to this topic.