The shape in the image is a triangular pyramid, also known as a triangular-based pyramid or tetrahedron. This type of pyramid has the following characteristics:

• It has 4 faces:
  • 1 triangular base.
  • 3 triangular side faces.

Thus, the number of faces is 4.

Would you like further details or have any questions?

Here are five related questions to think about:

1. How many edges does this triangular pyramid have?
2. How many vertices does a triangular pyramid have?
3. What is the formula for calculating the surface area of a pyramid?
4. How does the number of faces differ between a triangular and square pyramid?
5. How is the volume of a triangular pyramid calculated?

Tip: For any polyhedron, Euler's formula relates the number of faces, vertices, and edges: $F + V - E = 2$.