An isometry, t, is called a translation iff for all points P and Q, the points P, Q, T(P) and T(Q) would form a parallelogram if joined appropriately.
An isometry, t, is called a translation iff for all points P and Q, the points P, Q, T(P) and T(Q) would form a parallelogram if joined appropriately.
Translations are direct motions (orientation preserving).