The prompt was devised by David Aaron (a primary teacher in Blackpool, UK) for his year 6 class. The inquiries that developed from the prompt covered, amongst other things:
- angles in triangles
- angles on a straight line
- angles around a point
- angle properties of parallel lines
- exterior angles
- 2-d shapes composed of equilateral triangles
- the number of equilateral triangles of different sizes in the prompt.
David said: "All this in one lesson! I had to rein things in, but it personalised the learning brilliantly."