The invention is directed to a single or multiple piece precision geometric device for performing a variety of geometric functions such as locating the precise center of circular member and projecting the determined center to a distant surface, performing squaring functions (inside corners and outside corners), drawing numerous types of polygons, constructing perfect 45 degree angles, right triangles, squares of various sizes, perfectly formed rhombuses and perfectly symmetric isosceles triangles.The device may be in the shape of a cross with arms that extend outwardly from a center hole. Such arms may be foldable and/or removable to allow the geometric device to be better configured for a particular task.