Why not encourage pupils to discover rules of their own?

This problem links to "Triangles withinTriangles " and the problem "Triangles within Pentagons"

There are many different ways to visualise this question and pupils should be encouraged to explain how they "know" their rule works.

This problem links to "Triangles withinTriangles " and the problem "Triangles within Pentagons"

There are many different ways to visualise this question and pupils should be encouraged to explain how they "know" their rule works.