function Radius(a, b, c) {
      var _this;
      _this = _Initialize.call(this) || this;
      _this.radius = void 0;
      _this.name = void 0;
      _this.radius = Span.setSpanValue(a, b, c);
      _this.name = "Radius";
      return _this;
    }
Creates a new Radius instance.
@param {number|Span} a - The radius value or the lower bound of the radius range.
@param {number} [b] - The upper bound of the radius range (if a is a number).
@param {boolean} [c] - Whether to use center-based calculation (if a and b are numbers).