removing the polygon based on checkbox toggle

please look into the image for reference >>when i select the checkbox i am calling the getTerritory function from toggleTerritory(),that draws the polygon.But the problem i am facing is, i am not able to clear the polygon when checkbox is unselected. Can anyone help me in doing this.

toggleTerritory function is below.

`  $scope.toggleTerritory = function(item, list) {      
        var idx = list.indexOf(item);
        if (idx > -1)
            {
            list.splice(idx, 1);            
            //How to clear the polygon here 
            }
        else{
            list.push(item);
            $scope.getTerritory(item);//this creates the polygon


        }           

    };`