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I usually don't eat a half a sandwich... so there is no point in cutting it in half, although a foot-long sub sandwich can be a bit unwieldy.
It's scientifically unsound to cut them diagonally because it exposes more non-crusty bread surface than cutting them on a line perpendicular to the edges. The increased surface area causes the bread to dry out more quickly. I am sure you have observed that triangular sandwiches dry out more quickly.
It's because when they curl up, on British Rail trains for example, they can remain stable on a surface having just 3 points of contact. Unless they are the wrong way up of course.
corners fit in the mouth better without smearing the face- unless u bite into the hypotenuse of the triangle
Triangular sandwiches are better for three reasons:1. If you don't like crust, it is easier to avoid eating it because the long part without the crust is longer than in a rectangular cut sandwich.2. The triangular corners are easier to bite. With a rectangular sandwich, most people will take their first bite from the center rather than the corners, causing mayonnaise and mustard to end up smeared on their face.3. Even if you eat crust, most people like the part without crust better so a triangular cut lets them eat that part first, saving the less delectable parts for the end.