An enneadecagon is a polygon having 19 sides.
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An abnormal shape :) like a stopsign with 19 SIDES!
A Quadrilateral.
The answer depends on how many sides the shape has. For each number of sides (≥ 3), there is a shape that will meet the requirements of the question.
A shape with 9 sides, is a nonagon.
the shape with the most sides is unknown