If it is a closed figure which doesn't cross over itself (like a bowtie looking figure), then it is called a polygon.
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A sphere
a cirsquare
They are all polygons: two-dimensional shapes, bounded by straight lines.
no it is a 4 dimensional figure not a 3 dimensional figure * * * * * No. A quadrilateral is a two dimensional figure. It has a length and a breadth and no more.
A two dimensional figure does not have volume or depth such as flat surfaced polygons.