will do math now... my 42" LG monitor is 41" wide from left to right not diagonal... my logitech G11 (same body as your keyboard) is 21.5", using deductive reasoning by visually placing two keyboards side by side, or by doing simular with the claimed "19" monitor, your first picture is NOT a 50" plasma... the second picture (which is out of focus) has a different background and no taskbar or Anything similar to the first picture is might be 50", but the OP picture is not a 50" monitor...
math is fun
or we could count task bar icons.. you have 11 and it goes halfway... I have 15 and it is jst short of halfway
Edit: it also doesn't matter how big it is. You're still pretty and we all still like you!