How to reset radio buttons on reactive forms in angular 14

In my application, I need to reset input type radio button on cancel button click in reactive forms.

<form [formGroup]="form1">
<button click="save()">save</button>
<button click="Cancel()">Cancel</button>
<div *ngFor*="let items of itemarray">
<input type = "radio" (change)="onChange()" name="test_{{id}}" id="test_{{id}}">None</input>
<input type = "radio" name="test_{{id}}" id="test_{{id}}">Full</input>
</div>
</form>

in TS file

onChange()
{
this.form1.markasdirty();
}

cancel()
{
this.form1.reset()
this.itemarray = this.originalArry();
}

reset option is not resetting radio button existing value on cancel button. Also assigning fresh data to itemarray but its not reflecting on UI.

I tried below code on cancel button -

this.form1.get(this.form1.value).reset();

here I'm getting this.form1.value as undefine