mathematics terms

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