It's All Math

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Across
  1. 1. Length x Width
  2. 5. Numbers that include rational and irrationals
  3. 7. 1/2
  4. 10. Equal payments paid at regular intervals over a fixed period of time
  5. 11. Shape with four equal sides
  6. 12. Base area x height
  7. 13. Triangle with 3 equal sides
  8. 15. Value of an initial investment
  9. 16. Triangle with 2 equal sides
  10. 18. Special Square
  11. 21. Order of Operations Acronym
  12. 22. Opposite over hypotenuse
Down
  1. 2. Root of a number
  2. 3. Half of the diametre of a circle
  3. 4. Distance around an object
  4. 6. Numbers known as counting numbers
  5. 8. Whole numbers plus negatives
  6. 9. Natural Numbers including 0
  7. 14. Numbers that cannot be as a ratio of integers
  8. 17. Triangle with no equal sides
  9. 18. Numbers that include fractions
  10. 19. Opposite over adjacent
  11. 20. Adjacent over hypotenuse