Default Selection of radio buttons can be done by managing the property value.
Three
Four
Five
Your selection is {{class}}
<div ng-app="my_app" ng-controller="my_ctrl">
<input type=radio ng-model="class" value="Three" > Three
<input type=radio ng-model="class" value="Four" > Four
<input type=radio ng-model="class" value="Five"> Five
<br><br>
Your selection is {{class}}
</div>
<script>
var app = angular.module('my_app', []);
app.controller('my_ctrl', function($scope) {
$scope.class='Four' // default selection
});
</script>
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