Pi Day

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Across
  1. 3. A trigonometric function that, for an acute angle in a right triangle, is the ratio of the side adjacent to the angle to the hypotenuse.
  2. 5. A number that can be expressed as a fraction.
  3. 6. A tool used for performing mathematical computations.
  4. 9. An expression consisting of variables and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables.
  5. 11. (of a function), An input value that produces an output of zero.
  6. 13. A number that cannot be expressed as a simple fraction.
  7. 15. Having the same shape but possibly different sizes.
  8. 16. An ancient calculating tool using beads.
  9. 20. (of a parabola), The point where a parabola changes direction.
  10. 21. A number or expression that divides evenly into another.
  11. 22. A trigonometric function that, for an acute angle in a right triangle, is the ratio of the side opposite the angle to the hypotenuse.
  12. 24. The set of output values a function can produce.
  13. 25. A quantity representing the power to which a given number or expression is to be raised.
  14. 26. The numerical factor in a term.
  15. 29. A single number or variable, or numbers and variables multiplied together.
  16. 32. An algebraic expression with two terms.
  17. 33. A general proposition not self-evident but proved by a chain of reasoning.
  18. 34. A relationship or function whose graph forms a straight line.
  19. 35. The exponent that indicates the power to which a base number is raised to produce a given number.
  20. 38. A closed plane figure with straight sides.
  21. 39. A number expressed in base 10.
Down
  1. 1. A line that a curve approaches but never touches.
  2. 2. A statement that two values are not equal.
  3. 4. A symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side.
  4. 7. The set of input values for which a function is defined.
  5. 8. A value that does not change.
  6. 10. The arithmetic operation of splitting into equal parts.
  7. 12. The extent or measurement of a surface.
  8. 14. A straight line passing from side to side through the center of a circle or sphere.
  9. 17. A set of values that show an exact position.
  10. 18. An equation or expression in which the highest power of an unknown quantity is a square.
  11. 19. The highest exponent of a polynomial.
  12. 23. The continuous line forming the boundary of a closed geometric figure.
  13. 27. (two words) The trend of a function as x approaches positive or negative infinity.
  14. 28. An algebraic expression with three terms.
  15. 30. A function defined by multiple sub-functions, each applying to a certain interval of the main function's domain.
  16. 31. A relation or expression involving one or more variables.
  17. 36. The highest value of a function within a given interval.
  18. 37. A semicircular tool used for measuring angles.