Answer
Euler's formula is valid.
Work Step by Step
Here, we have:
$Faces(F)=6$; $Vertices(V)=4$ and $Edges(E)=9$
We will write Euler's formula for two dimensional figures.
$F+V=E+1$
or, $6+4=9+1$
or, $10=10$
Euler's formula is valid.