how tdo i set a radio button to be checked using angular reactive forms code example

Example: angular 9 radio button checked

Try to specify value attributes. And do not forget that in case of radio buttons Model is not supposed to contain boolean value but should contain radio specific values like:

  <input type="radio" name="food" value="beef" [(ngModel)]="myFood"> Beef
  <input type="radio" name="food" value="lamb" [(ngModel)]="myFood"> Lamb
  <input type="radio" name="food" value="fish" [(ngModel)]="myFood"> Fish