problem
Four Triangles Puzzle
Age
5 to 11
Challenge level
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
Inside Triangles
Age
5 to 7
Challenge level
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
problem
Nine-Pin Triangles
Age
7 to 11
Challenge level
How many different triangles can you make on a circular pegboard that has nine pegs?