A plain figure is a simple figure.
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an octagon.
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
A square is a flat plain figure whose four sides are of equal length.A rectangle is a flat plain figure whose lengths are longer that the widths.So a rectangle is not like a square!
A shape in 2-dimensional space - a flat shape.
it may be a parallelogram or a kite both have opposite sides equal