	Squares can be realised in two distinct ways. How much bigger is the one made from 4 right angled isosceles triangles? The chief attributes of Polydron are its connectivity and fold-a-bility. Squares can easily be clicked together to make other shapes. Can you find all 12 distinct pentominoes? (n.b. a pentomino is a shape made from 5 squares butt jointed together along a common edge)
Do all your pentominoes have the same perimeter length? How many pentominoes have line symmetry? Rotational symmetry? How many of the pentominoes will fold up and clip together to make 'lid-less' boxes? Why not discuss first which will fold up - which won't, before trying to fold them?