You may also like

problem icon


How many triangles can you make on the 3 by 3 pegboard?

problem icon

Cutting Corners

Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?

problem icon


Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?

Triangle Relations

Age 7 to 11 Challenge Level:

Here is an isosceles triangle and an equilateral triangle:

green isosceles triangle and yellow equilateral triangle

You will need to print off and cut out the two triangles to try this problem. (Here is a sheet of them which you could print off.)

What do the two triangles have in common?

How are they related?