 This is a mathematical snack from the Association of Teachers of Mathematics. Here we've got a tangram. It's a dissection puzzle. It's a square that's been cut into seven polygons. These seven pieces are two large right-angled isosceles triangles, one medium right-angled isosceles triangle, one parallelogram, two small right-angled isosceles triangles and one small square. From these seven pieces I can make a rectangle. This rectangle is made from the same seven pieces that I started from. To make your tangram you need to draw a square. Find the midpoint at the top and on the side and draw a diagonal line between these two midpoints and these two vertices. Then find the midpoint of this diagonal and this diagonal and then the midpoint between the vertex in the centre and the vertex in the centre. And join the dots which will give you your own version of the tangram. There it is again. You can make each of these shapes by rearranging the seven pieces of the original tangram. See how many you can make.