A polygon!
a polygon
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A quadrilateral - if the sides are straight lines.
An unequal triangle is a closed plane figure bounded by three straight lines such that the length of at least one of the lines is different from that of another.
A polygon
it's a closed figure with straight sides
A plane figure cannot be bounded by only one straight line. If the shape is bounded by lines which are not straight or by several straight lines the answer will depend on exactly what these are.