the circle of ___

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Across
  1. 5. a line cutting another line in half
  2. 7. regular polygon with 7 sides
  3. 8. polygon with three sides
  4. 12. the center of the inscribed circle of a polygon
  5. 15. perimeter of a circle
  6. 16. polygon with equal sides
  7. 18. regular polygon with three sides
  8. 19. the two circles are at the same side of the tangent
  9. 20. the distance between the chord and the center
  10. 22. a line touching the circumference with 2 overlap points
  11. 23. regular polygon with 8 sides
  12. 25. an angle out side of a fixed figure
  13. 27. regular polygon with 10 sides
  14. 29. the angle within a figure
  15. 30. regular polygon with four sides
  16. 31. regular polygon with 5 sides
  17. 32. radius
Down
  1. 1. a circle which passes through all the vertices of the polygon.
  2. 2. four sided polygon
  3. 3. crossing each other
  4. 4. a fixed, multi-sided figure
  5. 6. the triangle with all vertexes on the circumference
  6. 9. diameter
  7. 10. regular polygon with 12 sides
  8. 11. the two circles are at different sides of the tangent
  9. 13. a line segment with both of its end points on the circumference
  10. 14. a line touching the circumference with only one touching point
  11. 17. the center of the circumcircle
  12. 19. triangle with equal legs
  13. 21. the two lines’ intersect angle is 90 degrees
  14. 24. regular polygon with 6 sides
  15. 26. fan
  16. 28. regular polygon with 9 sides