Deducing Formulae
In this activity pupils use dynamic geometry software to explore the area of shapes and derive formulae. The dynamic geometry resources are provided in two formats - Geometer’s Sketchpad and Geogebra

The resources cover objectives from Year 8:
  • Derive and use formulae for the area of a triangle, parallelogram and trapezium
  • Calculate areas of compound shapes
You can use these resources to encourage pupils to make predictions about how changes in the dimensions of 2-D shapes such as triangles and parallelograms will affect the area of those shapes and so help them to develop formulae for calculating the areas.

There are opportunities for:
  • Using ICT in the mathematics classroom
  • Whole class teaching
  • Paired work
  • Discussion and reflection
  • Making and testing predictions
Download resources