If you can post the triangle with either the blue or yellow colour face up, how many ways can it be posted altogether?

This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.

How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?

What shape is the overlap when you slide one of these shapes half way across another? Can you picture it in your head? Use the interactivity to check your visualisation.

What do these two triangles have in common? How are they related?

Can you each work out what shape you have part of on your card? What will the rest of it look like?

Find all the different shapes that can be made by joining five equilateral triangles edge to edge.

Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?

Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?

Make an equilateral triangle by folding paper and use it to make patterns of your own.

What do you think is the same about these two Logic Blocks? What others do you think go with them in the set?

Can you find out how the 6-triangle shape is transformed in these tessellations? Will the tessellations go on for ever? Why or why not?

Explore ways of colouring this set of triangles. Can you make symmetrical patterns?

This activity challenges you to make collections of shapes. Can you give your collection a name?

Investigate these hexagons drawn from different sized equilateral triangles.

Arrange the shapes in a line so that you change either colour or shape in the next piece along. Can you find several ways to start with a blue triangle and end with a red circle?

This interactivity allows you to sort logic blocks by dragging their images.