Here are shadows of some 3D shapes. What shapes could have made them?
The challenge for you is to make a string of six (or more!) graded cubes.
How many balls of modelling clay and how many straws does it take to make these skeleton shapes?
Interior angles can help us to work out which polygons will tessellate. Can we use similar ideas to predict which polygons combine to create semi-regular solids?
In a right-angled tetrahedron prove that the sum of the squares of the areas of the 3 faces in mutually perpendicular planes equals the square of the area of the sloping face. A generalisation of Pythagoras' Theorem.
