The so-called three views, your side view direction is C-A direction, so the red box part is just perpendicular to the line of sight direction, and it overlaps with EBB 1E 1 in the side view, so what you can see is really BCB 1C 1. Your picture is EBB 1F, which should be a paragraph (red box position).

In addition, the plane ABB 1A 1 is inclined to you at a certain angle, so the plane in the front view is shortened, so it seems that AB is equal to AE (but the front view looks like this, in fact, the AB you see becomes SIN 60 * AB = AE). For example, a ruler will become shorter if it is tilted at a certain angle, which is the reason.