is the problem asking just to verify it? or is there supposed to be an image
You just need to verify it. That is, you will need to count the number of faces ($F$), vertices ($V$), and edges ($E$) of the regular octahedron, and verify that indeed $V - A + F = 2$.
For this purpose a picture is not needed, since we know it is formed by $8$ equilateral triangles. (Think of two square pyramids glued together by their square faces.)