geometry

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Across
  1. 4. trangle with square base
  2. 7. when 2 edges meet
  3. 8. shape with 5 sides
  4. 9. 3d circle
  5. 11. 3d circle
  6. 12. inside of shape
  7. 13. 3d square
  8. 14. 4 sided shape
  9. 16. outside of shape
  10. 18. a^2+n^2=c^2
  11. 19. 3 sided shape
Down
  1. 1. longest side of a triangle
  2. 2. how full the inside of a shape is
  3. 3. the length of inside of a 3d shape
  4. 5. half of diameter
  5. 6. triangle with circle base
  6. 10. same size sides
  7. 11. shape with no edges
  8. 15. triginomitry
  9. 17. 90 degrees