(a) Axioms of incidence geometry are satisfied. It has euclidean parallel geometry (b)Axioms of incidence geometry are satisfied It has euclidean parallel geometry (c)Axioms of incidence geometry are not satisfied It has hyperbolic parallel geometry (d)Axioms of incidence geometry are satisfied It has euclidean parallel geometry Solution (a) Axioms of incidence geometry are satisfied. It has euclidean parallel geometry (b)Axioms of incidence geometry are satisfied It has euclidean parallel geometry (c)Axioms of incidence geometry are not satisfied It has hyperbolic parallel geometry (d)Axioms of incidence geometry are satisfied It has euclidean parallel geometry.