Random Again

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Across
  1. 2. The 3 in 23
  2. 5. A graph with circles
  3. 9. The top of a fraction
  4. 10. What can't be under a square root
  5. 13. Something that never changes
  6. 15. Number being divided
  7. 16. Largest country
  8. 17. Solid with 3 faces
Down
  1. 1. Regular quadrilateral
  2. 3. The bottom of a fraction
  3. 4. Most popular sport in the world
  4. 6. Solid with 2 faces
  5. 7. Quadrilateral with a pair of parallel sides
  6. 8. The 3 in 123456789
  7. 9. A triangle with sides 1, 2, 3
  8. 11. The 2 in 32
  9. 12. Here
  10. 14. Last
  11. 18. Measures area