A regular shape. ( square -regular rectange-, regular pentagon, regular hexagon, equilateral triangle etc. etc.)
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No because it is flat 2d shape with 4 equal sides
Well its still a 2d because its like a normal square
A ten-sided 2D polygon is known as a decagon.
A rhombus. (Which is in fact also an equilateral parallelogram)
Any 4 sided 2D shape