Algebra 1 crossword puzzle

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Across
  1. 3. volume
  2. 7. addition
  3. 9. whole
  4. 10. pythagorean
  5. 12. slope
  6. 13. rational
Down
  1. 1. angles
  2. 2. formula
  3. 4. graphs
  4. 5. pi
  5. 6. area
  6. 8. natural
  7. 11. exponent