Lincoln Mu Alpha Theta

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Across
  1. 4. the only number which can not be represented by Roman numerals
  2. 7. a flat geometric figure of four sides and four angles
  3. 11. a number or algebraic expression that divides another number or expression evenly
  4. 13. a puzzle in which players insert the numbers one to nine into a grid consisting of nine squares subdivided into a further nine smaller squares
  5. 14. the four infinite regions divided by axes on a coordinate plane
  6. 17. a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression
  7. 18. the ____ sequence occurs when each number is the sum of the two preceding ones
  8. 19. a mathematical expression or function so related to another that their product is one
  9. 21. the only number that has letters in alphabetical order
Down
  1. 1. a system of numerical notation that has 2 rather than 10 as a base
  2. 2. 2D geometric shape that doesn't have any vertices
  3. 3. the longest side of a right triangle, opposite the right angle
  4. 5. the name of an angle of more than 90 degrees but less than 180 degrees
  5. 6. a symbol and placeholder for any mathematical object
  6. 8. the number of digits in pi
  7. 9. the opposite of an exponent that is represented with a symbol '√' also known as root
  8. 10. a result obtained by dividing one quantity by another
  9. 12. the only even prime number
  10. 15. one followed by 100 zeros
  11. 16. the other name for The International Day Of Mathematics
  12. 20. a common math term that means "for every one hundred" in Latin