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Calculating perimeter and area is a fundamental skill for Edexcel GCSE Mathematics. This lesson covers the formulae for rectangles, triangles, parallelograms, trapeziums and circles, then extends to sectors and composite shapes. Pay careful attention to which formulae are given on the Edexcel formula sheet and which you must memorise.
| Term | Meaning |
|---|---|
| Perimeter | The total distance around the outside of a 2D shape |
| Area | The amount of 2D space inside a shape, measured in square units (cm², m², etc.) |
| Circumference | The perimeter of a circle |
| Sector | A "pizza slice" of a circle (bounded by two radii and an arc) |
| Composite shape | A shape made up of two or more simpler shapes |
These are NOT given on the Edexcel formula sheet:
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