For the planar graph shown:

1. Number of interior faces: Count the regions inside the graph that are enclosed by edges. The graph has 3 interior faces.

2. Total number of faces: In a planar graph, the total number of faces includes all interior faces plus the exterior face. Therefore, the graph has 4 faces in total.

3. Euler's formula: Euler's formula for planar graphs is $V - E + F = 2$, where $V$ is the number of vertices, $E$ is the number of edges, and $F$ is the number of faces.

   For this graph:

   • $V = 6$ (vertices: A, B, C, D, E, F)
   • $E = 8$ (edges)

   So, substituting into Euler's formula, we get: $6 - 8 + 4 = 2$

4. Faces for another planar graph: Without the graph shown, it’s not possible to calculate how many faces another graph would have without further details.