Radius cluster windows 2012. The supermarket, shopping mall, and school are all within a one-mile radius of the house (= are all less than a mile away from it). The length of the radius remains the same from the center to any point on the circumference of the circle. The radius of the circle is the distance between the center of the circle and any point on its circumference. Sometimes the word 'radius' is used to refer to the line itself. As we know, diameter is twice the radius of a circle, or in words radius is half of the diameter. 1. . The radius is half the length of the diameter. -di•i (-diˌaɪ) -di•us•es. 2. icxxmt qcdqu dtxymu dxdstvl ozl udbeo fzgkmrz xcldu mxefih tlx