IMC Key Stage 2 · 8. Area and perimeter of polygons
Choose a good base and height, compare triangles by shared heights and bases, and use 'whole minus pieces'.
IMC Key Stage 2 (EMIC) – Selected topics
Find areas of rectangles, triangles and parallelograms with the right base and height.
Compare areas of triangles that share a height or a base, using ratios.
Turn side ratios into area fractions for corner triangles.
Find shaded areas by cutting, adding and subtracting simple pieces.
Set up and solve simple equations for perimeters.