#MeasurementAndSpace >[!info]- [Two-dimensional spatial structure A | NSW Curriculum Website](https://curriculum.nsw.edu.au/learning-areas/mathematics/mathematics-k-10-2022/content/stage-3/fad7c142c4) MA3-2DS-01 investigates and classifies two-dimensional shapes, including triangles and quadrilaterals based on their properties MA3-2DS-02 selects and uses the appropriate unit to calculate areas, including areas of rectangles MA3-2DS-03 combines, splits and rearranges shapes to determine the area of parallelograms and triangles >[!abstract]- Prior Knowledge >- Two-dimensional Spatial Structure (Stage 2) ## 2D shapes: Classify two-dimensional shapes and describe their properties - Identify and classify triangles as equilateral, isosceles or scalene triangles - Recognise that triangles and quadrilaterals can be classified in more than one way (Reasons about spatial relations) - Compare side and angle properties of triangles and quadrilaterals using measurement and symmetry - Investigate the symmetry properties (line and rotational) of quadrilaterals - Identify regular and irregular polygons ## Area: Use hectares and square kilometres as units of measurement for area - Recognise the need for formal units larger than the square metre - Identify situations where square kilometres and hectares are used for measuring area - Equate one hectare to the area of a square with side lengths of 100 m, ie 10 000 square metres = 1 hectare (ha) - Record areas using square kilometres and hectares ## Area: Calculate the areas of rectangles using familiar metric units - Recognise the importance of using the same units of length on the sides of rectangles to create ‘square units’ - Establish the relationship between the lengths, widths and areas of rectangles - Record, using words, the method for finding the area of any rectangle - Calculate areas of rectangles in square centimetres (cm$^2$), square metres (m$^2$) and square kilometres (km$^2$) - Recognise that rectangles with the same area may have different dimensions - Investigate and compare the areas of rectangles that have the same perimeter