3D Shapes: cuboids, cylinders, square pyramids, prisms, etc. are commonly tested in 11+ and Selective School exams in the UK.

## Examples

### Example Question 1:

How many more edges does a cuboid have than a triangular prism?

**Answer:** 3

**Explanation:** A cuboid has 12 edges and a triangular prism has 9 edges. 12 – 9 = 3

### Example Question 2:

Which shape can be folded up to make a tetrahedron?

(a) (b) (c) (d)

**Answer:** (c)

**Explanation:** A tetrahedron has 4 triangular faces, as in (c). (There is also another possible net for a tetrahedron.)

Shape (a) is not a net of a 3D shape. Shape (b) is a net of a triangular prism. Shape (d) is a net of a square-based pyramid.

## Video Tutorials

### Nets of 3D shapes