Our 3-D shapes

This week in our maths leason we made 3-D shapes. A 3-D shape is a three dimensional shape.A 3-D shape has edges and sides and vertices .For exsample  a cube and a cubiod and a tetrahedron they are all 3-D shapes . In the shape tetrahedron tetra is Greek for four. You can make a tetrahedron from a empty  crisps bag you will need  sticky tape pull the middle points at the front and back of the open end of the bag away from each other until the bag closes seal with the sticky  tape .Crease the edges from corner to corner to make a shape of a tetrahedron.
By,Anna Molloy.