4 Teaching about area and volume
Area is a measurement of the amount of space inside a 2D shape and is reckoned by the number of unit squares inside the shape. Common metric units of area are square centimetres (cm2), square metres (m2) or hectares (ha) for measuring land areas. A hectare is defined as 100 m × 100 m or 10 000 m2. Imperial measures of area are square inches, square feet and acres for measuring land areas.