ANSWERS: 6
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a shape has to be closed in order to be a shape
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Would a marquise be a shape? If so, you can have a shape with only 2 sides!
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I don't know if a half-circle is a proper shape but thats only got two sides!
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A spherical shell has two sides: an inside and an outside. In two dimensions, a circle has an inside and an outside. A solid convex lens shape can have two sides. In terms of polygons, an octagon has 8 sides, a triangle 3 sides, and the "polygon" with two sides consists of two coincidental line segments with opposite sense. Mathematically, it's a perfectly good polygon, but it has no area enclosed, so pedants might disqualify it from being a 'shape'.
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You can.
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Curves are not sides.
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