Theorems and Postulates for Geometry This is a partial listing of the more popular theorems, postulates and properties needed when working with Euclidean proofs. You need to have a thorough understanding of these items. General:Reflexive Property A quantity is congruent (equal) to itself. a = aSymmetric Property If a = b, then b = a.Transitive … [Read more...] about Theorems and Postulates for Geometry