In flatland the square is described as what?

Answer 1

I will assume flatland describes the ficticious two dimensional (2D) world. In our world spacial dimensions are three dimensional (3D), meaning length, width, and depth (or height). In 3D, we see a square as a flat object with length and width. In 3D we see boxes or retangulars as having length, width, and depth. Flatlanders cannot visualize 3D just like we cannot visualize 4D.

In flatland everything is 2D, so a square may be called a retangular (or box, or cube, etc...)