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Amateur archaeologists found a mysterious 12-sided object from the Roman Empire that experts can't explain
It was a small metal object, about the size of a softball, with holes in each of its 12 sides and covered with small knobs. "We realized we'd found something really quite significant pretty ...
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Polygons - sum of interior angles
Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a ...