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Across
  1. 5. Nine sided polygon
  2. 7. Seven sided irregular polygon
  3. 8. Prism with six quadrilateral faces
  4. 12. Two circles at two ends
  5. 13. Constant cross-section
  6. 15. Football
  7. 16. Meet at right-angles
  8. 18. Regular triangular
  9. 19. Don't meet
  10. 22. Ice cream...........
Down
  1. 1. Has six straight sides
  2. 2. More than 90° but less than 180°
  3. 3. Closed plain shape, at least 3 sides
  4. 4. 2D representation of a 3D shape
  5. 6. Solid with flat polygon faces
  6. 8. Round
  7. 9. Splits in two identical halves
  8. 10. Four sided polygon
  9. 11. Four sides, the same length
  10. 14. Triangle with no equal lengths
  11. 17. Where three or more faces meet
  12. 20. Less than 90°
  13. 21. Where two faces meet