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Across
  1. 5. Set of points satisfying a condition
  2. 6. Adjacent side ratio
  3. 8. Number without imaginary part
  4. 9. Line a curve approaches
  5. 11. Number involving square root of negative one
  6. 14. Opposite to adjacent side ratio
  7. 16. Reciprocal of cosine
  8. 17. Oval-shaped curve
  9. 21. Open curve with two branches
  10. 22. Fixed value
  11. 23. Slope of a function
  12. 24. Point where axes meet
  13. 25. Reciprocal of tangent
Down
  1. 1. Line touching a curve at one point
  2. 2. Shape formed by intersecting a cone
  3. 3. Combination of real and imaginary numbers
  4. 4. Distance from zero
  5. 7. Coordinate system with radius and angle
  6. 10. Study of angles and triangles
  7. 12. Number before a variable
  8. 13. Relation between two expressions
  9. 15. Reciprocal of sine
  10. 18. Equation true for all values
  11. 19. Ratio in a right triangle
  12. 20. Coordinate system