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In the field of abstract algebra, there is an important branch for the foundations of mathematics, namely group. The group is a non-empty set with some certain axioms. In the group, there is an interesting part, that is finite group. For the finite group has been defined the commutativity degree as the comparasion between the number of commutative elements of group and its order. If the finite group is commutative, then its commutativity degree is one. If the finite group is not commutative, then its commutativity degree is less than one. One example of a non-commutative finite group is a dihedral group. A dihedral group is a group which elements are the result of a composition of two permutations with predetermined properties. Keith Conrad in his article entitled" dihedral group" specifically discussed about the special properties of the group. Keith Conrad defined dihedral groups as a result of reflection and rotation …