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Perimeter and Area
Revision Notes
Key Points
- Perimeter is the total distance around a closed shape
- Area is the total space inside a closed shape
- Formulas exist for calculating perimeter and area of common shapes like rectangles, triangles, and circles
- Perimeter formulas involve adding side lengths, while area formulas involve multiplying dimensions
- Understanding and applying these formulas is crucial for solving mensuration problems in IGCSE Mathematics
Definition of Perimeter and Area
Perimeter is the total distance around the outside of a closed shape.
Area is the total space inside a closed shape.
Formulas for Common Shapes
Rectangles
- Perimeter = 2 × (length + width)
- Area = length × width
Triangles
- Perimeter = length of side 1 + length of side 2 + length of side 3
- Area = 1/2 × base × height
Circles
- Perimeter (Circumference) = π × diameter
- Area = π × radius^2