Edit in JSFiddle

Result
HTML
JavaScript
CSS

<body ng-app="myApp" ng-controller="toggleDIV">
    
    <input type="button" ng-click="toggleDiv()" value="Toggle Div" />
       
    <div ng-show="divToShowHide">Hello</div>
    
</body>

var app = angular.module('myApp',[]);

app.controller("toggleDIV", function($scope){

    $scope.divToShowHide = true;
    
    $scope.toggleDiv = function(){        
        $scope.divToShowHide = $scope.divToShowHide === true ? false: true;
    };
    
});

div{ background: #2e7cb8; padding: 10px; color: #fff; }