(keep in mind a rectangle is a square) a window, door, tv, computer, ect.
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chess board.
a cube, postit notes
Numbers have square roots.Drawings or shapes on paper don't.Neither do solid shapes or objects.
That doesn't make any sense. You take square roots of numbers, not of arbitrary objects.
Square metres. Square centimetres for small objects like a sheet of paper, square kilometres for a town or lake.