code: public void setRadius(com.google.api.ads.adwords.axis.v201809.cm.ConstantOperand radius) {
          this.radius = radius;
      }
docs: Sets the radius value for this LocationExtensionOperand.
  
  @param radius   * Distance in units specifying the radius around targeted locations.
  Only long and double are supported constant types.
  <span class="constraint Required">This field is
  required and should not be {@code null}.</span>