Nets of 3D Shapes and open boxes are often tested in 11+ and Selective School exams in the UK.
Example Question 1:
Which of the following shapes are nets for a cube?
Explanation: A cube has 6 faces which rules out option (c). Shapes a and e are impossible to fold into a 3D cube.
Example Question 2:
Which of the following shapes are nets for an open box?
Answer: a & d
Explanation: A net for a box needs a base and 4 sides. The side faces need to be positioned so that they provide an edge for the box and this is not possible in answer options b, c & e