mindmap root((周边)) perimeter applies to the line bounding any area or the surface bounding a solid: walked the ~ of the property every evening. periphery though sometimes interchangeable with perimeter, is likely to apply to the actual edge, border, or boundary of something concrete: explore the ~ of the island; or to limits which cannot be exceeded: the ~ of consciousness. circuit applies to a route, or often a journey, around a periphery or sometimes to any path that comes back to its point of beginning: the hands of the clock made a ~ of the face. compass is likely to refer to the area or space enclosed within a periphery or to the ground that figuratively might be passed over by the leg of a compass in describing a circle: taxed all the land within the ~ of the town. circumference applies to the line that describes a circle or an ellipse or the length of such a line , or to something felt to have a center: built fires within the ~ of the camp.