How many triangles can you make on the 3 by 3 pegboard?
Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
Can you make these equilateral triangles fit together to cover the
paper without any gaps between them? Can you tessellate isosceles
This problem is taken from the UKMT Mathematical Challenges.