Are all prisms made up of 2-D shapes?

Answer 1

Technically, anything 3D or 4D is "made up of" 2D shapes. 2D to most people nowdays means a flat surface, such as a piece of paper. So it cannot be a prism, technically. Although to my mind, I can visualize that a sheet of plastic held at the right angle to a light, could possibly become a prism. But that plastic doesn't truly fit the 2D meaning. 2D means it can be measured in 2 directions only. That it HAS only 2 dimensions. ACTUALLY, I am always aware that even a sheet of paper (or whatever) isn't truly 2D even, as it can actually be measured in 3 directions-the paper HAS a thickness too, plus, it exists in a certain time and space, so..even paper is 3D + time + location. Agreed? BUT other people use a sheet of paper as an example of 2D. 2D is a very strange thing to use as an example for anything, as even a straight line made in ink can be measured in 3 directions. Even the ink line has a thickness. (Plus time & location.) But other people would call it 2D. Here's a thought for you- this text on your screen right now has how many dimensions/directions it can be measured? :) Others would say 2D. Actually, it can be measured horizontally, vertically, and is 1 pixel thick on your screen. Is that 2D or 3D? Joke- since it's really just light, electricity, & data... does it have any dimensions at all? Nothing in this dimension can cease to exist, it can only be changed. So- does that apply to this text??? Hit delete. It becomes 3D but in a past space-time line? lol Cyberspace is whole new ballgame, huh? lol Is a memory in our minds 1D, 2D, 3D, or no D at all? :) Don't think about that 1 too hard. lol Confused? yeh, feels fun, huh? :)I make 3D items in a 3D community online, so if I make a triangle prism in a 3D program, each side is 2D, but it has no inside at all, no thickness really, which in the Earth 3D world would mean it wouldn't exist at all. i can make it seem to have a solid core, but I sure can't take it out of my computer & play with it on the lawn. lol

Then again, a triangle prism (or any other) has what people would CALL 2d on each side, so the way you word that question, with "made up of", could possibly mean EACH SIDE. Then the answer would be yes. Except that doesn't account for at least a 1 atom thickness of those sides. Almost makes it a question of "do you want technically, or in general, or an in general example, or a figure of speech?" Sorry, my brain just can't accept a figure of speech ("an expression") to answer a scientific question. lol Would have made this answer lots shorter.