Is it possible to have a tetrahedron whose six edges have lengths 10, 20, 30, 40, 50 and 60 units?
Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?
How many winning lines can you make in a three-dimensional version of noughts and crosses?
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
The edges of a cube are stretched, can you find the new surface area?
Which of these can be obtained by rotating this shape?
Which faces are opposite each other when this net is folded into a cube?
What is the total surface area of this shape?
The net shown is folded up to form a cube. What is the largest possible vertex product?