Vector2.DistanceSquared Method (Vector2, Vector2)
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)
Distance is calculated with the formula:
Distance squared is the value before taking the square root. Distance squared can often be used in place of distance if relative comparisons are being made. For example, consider three points A, B, and C. To determine whether B or C is further from A, compare the distance between A and B to the distance between A and C. Calculating the two distances involves two square roots, which are computationally expensive. However, using distance squared provides the same information and avoids calculating two square roots.