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I found a necklace and took a picture.  It has 10 sides.

A decagon

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A pattern block in math class.

A trapezoid

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The red stop sign with white letters on it standing outside on the street

A hexagon

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The floor of a sixteen-sided treading mill at Mount Vernon, home of George Washington.

a hexakaidecagon

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The floor at a metro station in Washington DC

regular hexagons