problem
Favourite
Four Triangles Puzzle
Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
problem
Favourite
Inside Triangles
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
problem
Favourite
Nine-Pin Triangles
How many different triangles can you make on a circular pegboard that has nine pegs?