Cong who goes to St. Peter's RC Primary, Aberdeen, sent in a correct solution to this problem. The key to answering it is to be sure you know what you mean by "different" triangles. Cong found 7 different triangles could be drawn on the nine-pin board which he drew:

He also sent in a table which gave some more information about each triangle:

Number	Colour	Type
1	Green	Isosceles
2	Light blue	Scalene
3	Purple	Scalene
4	Orange	Isosceles
5	Pink	Scalene
6	Blue	Isosceles
7	Red	Equilateral

Well answered, Cong, thank you.