Awkward Triangles
In this short activity, pupils find the area of ‘awkwardly-shaped’ triangles. Pupils use dynamic geometry software to manipulate the image of a triangle and calculate its area.

Objectives covered:
  • This activity provides extension work for year 11 pupils and covers calculating areas of triangles using the formula ½ ab sin(C)
This short piece of work (less than a whole lesson) models how exploration of a dynamic image can deepen pupils' understanding. The lesson notes describe how to manipulate the image and suggest some questions to ask the pupils. Once you have used this method, you could explore other areas of algebra and geometry in similar ways.

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