11 millimeters is approximately 0.43 inches wide. To visualize it, it's slightly less than half an inch. In terms of everyday objects, it's about the width of a standard pencil lead or a small button.
11mm x 11mm = 121 mm2
11mm=1.1cm
Yes, 11mm is smaller.
11mm
1.1
no
It sounds like maybe a .45 ACP. If the bullet is 11mm wide (diameter) and the case (not counting the bullet) is 25mm long, that sounds about right for a .45 ACP round.
As long as it has an 11mm ring mount then Yes. And I think it does, or you can order 11mm scope rings for the scope.
1.1cm
0.011 metres
Yes.
42mm