The shape of the coin, on the other hand, hasn’t changed. It’s still a dodecagon, or 12-sided shape. We’ve written before at HuffPost UK about why we call a pound a “quid.” But why does ...

ADA: These properties tell us it’s a polygon.A polygon is a closed shape made of straight lines.Your pond is a type of polygon called a decagon, because it has ten sides and ten angles.And ...