Shapes

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Across
  1. 5. A three-dimensional shape with a polygonal base and flat sides
  2. 6. A three-dimensional shape with a curved surface and no edges
  3. 7. A flat, two-dimensional shape with three sides
  4. 8. A three-dimensional shape with a flat base and a vertex
  5. 10. A three-dimensional shape with four faces and six vertices
  6. 12. A three-dimensional shape with a circular base and curved sides
  7. 13. A flat, two-dimensional shape with eight sides
  8. 15. A flat, two-dimensional shape with an infinite number of sides
  9. 16. A three-dimensional shape with no edges or vertices
  10. 17. A three-dimensional shape with six faces and eight vertices
  11. 18. A flat, two-dimensional shape with five sides
Down
  1. 1. A three-dimensional shape with a circular base and flat sides
  2. 2. A flat, two-dimensional shape with four sides and unequal lengths
  3. 3. A three-dimensional shape with one circular base and one vertex
  4. 4. A flat, two-dimensional shape with four sides and four right angles
  5. 8. A flat, two-dimensional shape with four sides and one right angle
  6. 9. A flat, two-dimensional shape with six sides
  7. 11. A three-dimensional shape with eight faces and twelve edges
  8. 14. A three-dimensional shape with twenty faces and thirty edges