When you have to describe a 3D shape you have to keep the following definitions in mind:
1. The face of a 3D shape is a flat surface.
The shape on the picture has 3 rectangular faces and 2 triangular faces, a total of 5 faces.
2. The edge is where two faces meet.
For the shape on the picture, there are 3 edges, where the rectangular faces meet each other, and then three edges where the rectangular faces meet each of the triangular faces, this shape has a total of 9 edges.
3. The vertex is a corner, where the edges meet.
There are three vertices on each end of the shape, so it has a total of 6 vertices.
A shape that has 5 faces, 9 edges, and 6 vertices is a triangular prism.
