math topics

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Across
  1. 2. one endpoint
  2. 7. lines never meet
  3. 9. equal halves
  4. 10. internal tangent between circles
  5. 13. segment two endpoints
  6. 14. angle circle vertex
  7. 16. angle center vertex
  8. 19. half diameter
  9. 20. sum pattern
  10. 22. endless straight path
  11. 27. twice radius
  12. 28. ordered numbers
  13. 30. secant outside secant
  14. 32. arc shorter arc
  15. 35. sequence reciprocal arithmetic
  16. 36. sequence constant difference
  17. 37. additional postulate accepted statement
  18. 38. plane x-y graph
  19. 39. equation expanded form
  20. 40. point length
Down
  1. 1. algebraic expression
  2. 3. of a sector part of circle
  3. 4. horizontal line
  4. 5. of a circle wedge shape
  5. 6. round shape
  6. 7. on tangent line perpendicular radius
  7. 8. longest side
  8. 11. vertical line
  9. 12. circle ratio
  10. 15. two intersections
  11. 17. many sides
  12. 18. sequence constant ratio
  13. 21. circle line segment
  14. 23. external tangent outside circles
  15. 24. point of intersection
  16. 25. point location
  17. 26. half circle
  18. 29. arc longer arc
  19. 31. root fractional root
  20. 33. equation center-radius form
  21. 34. three sides