Answer:-
A shape with three sides that is not a triangle is impossible in standard geometry. By definition, any closed shape with three sides is always a triangle. However, if the shape is open or has curved sides, it wouldn't be classified as a triangle. For example, a three-sided figure with one curved edge could be considered a "curved triangle" in design but not in geometric terms. In abstract or non-Euclidean geometry, variations might exist, but in basic mathematics, a three-sided closed shape will always be a triangle. If you meant something else, feel free to clarify!
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