Properties of Quads

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Across
  1. 3. dd
  2. 4. bb
  3. 6. pp
  4. 7. ss
  5. 8. aa
  6. 11. hh
  7. 13. kk
  8. 15. ll
  9. 16. rr
  10. 17. ee
  11. 19. ff
Down
  1. 1. A family of shapes under 2 across that all have 2 pairs of parallel lines
  2. 2. cc
  3. 5. gg
  4. 9. A general name for shapes that have an interior angle sum of 360°
  5. 10. pp
  6. 12. jj
  7. 14. ww
  8. 18. cc
  9. 20. qq