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Establish the formulas for areas of rectangles, triangles and parallelograms and use these in problem solving (ACMMG159) * building on the understanding of the area of rectangles to develop formulas for the area of triangles, using manual strategies and digital technologies * establishing that the area of a triangle is half the area of an appropriate rectangle and using the formula A = ½bh, where b is the base and h is the perpendicular height of the triangle * using area formulas for rectangles and triangles to solve problems involving areas of surfaces, such as how many litres of paint will be needed to paint a shed wall if each litre covers 16m²