mathematics terms

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Across
  1. 4. amount of space
  2. 6. x
  3. 7. ^^
  4. 8. measure of certainly
  5. 9. .
  6. 11. 4
  7. 12. :
Down
  1. 1. %
  2. 2. 2
  3. 3. 4sides
  4. 5. percentage of selling price
  5. 10. 1