1												2
																	3
			4
		5																			6
														7
	8											9
			10
11																			12
					13
				14							15
16				17																		18
																	19
											20
21
													22
		23

Across 5. an 18 sided polygon 7. a 3 sided polygon 10. a 16 sided polygon 11. an 11 sided polygon 13. a 4 sided polygon 15. a 15 sided polygon 17. a 4 faced polyhedron 20. a 19 sided polygon 21. a 13 sided polygon 22. a 10 sided polygon 23. a 20 sided polygon

Down 1. a 6 faced polyhedron 2. an 8 sided polygon 3. a 9 sided polygon 4. a 20 faced polyhedron 6. a 14 sided polygon 8. a 12 sided polygon 9. a 12 faced polyhedron 12. a 17 sided polygon 14. an 8 faced polyhedron 16. a 7 sided polygon 18. a 5 sided polygon 19. a 6 sided polygon