use checkbox in angular

I want to use a checkbox in my form except that it does not appear. I only have the label. I do not have the checkbox to check

    <div class="form-check">
        <label class="form-check-label">
          <input class="form-check-input" type="checkbox" name="origine" value="ami" checked>
          Par un ami 
        </label>
    </div>