Proof that: Number of faces in the Cartesian product of two convex polytope is sum of individual faces

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We have two convex polytopes C1 of dim(m) and C2 of dim(n), in C1 we have d1 dimensional face and in C2 we have d2 dimensional face. How can we prove that C1 X C2(Cartesian product) has dimensional face (d1+d2)?