What's the boundary that seperated a 2D from a 3D?
Like, if one thinks about it, them there's no proper 2D object in this world.
Yes, we might say that a sheet of paper is a rectangle (2D object), but it has it's own thickness right?
So can one say a 3D object can be considered a 2D object if it's thickness is smaller than the possible thickness (Planks Length).
But that's impossible right, since to have something to exist smaller than Planks Length means it has to have the energy required for a flipping black hole.
So, then why did we study geometry? If I go by this reason, aren't there no real 3D figures? Then what exactly are we perceiving? What exactly am I supposed to do?