Mathematics
Measurement
Procedural
8–9 yrs
Perimeters of polygons
多边形的周长
Description
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)
Mastery Evidence
- 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 your child work out the length of the other side — without drawing it?
