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1. The sum of the lengths of the outer sides of a polygon is called the ____________________.
2. A circle is a geometric figure with all points at a fixed distance from its center called a ____________________.
3. The amount of space inside a three-dimensional shape is called its ____________________.
4. A quadrilateral with opposite sides parallel and equal in length is called a ____________________.
5. A geometric shape with eight faces, twelve edges, and six vertices is called a ____________________.
6. The distance around the outside of a circle is called its ____________________.