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Across
  1. 2. Perimeter of a circle
  2. 3. Five-sided polygon
  3. 5. Distance from center to edge
  4. 9. Angle more than 180 degrees
  5. 10. Angle exactly 90 degrees
  6. 11. Ratio of circumference to diameter
  7. 15. Opposite sides equal
  8. 16. Twice the radius
  9. 17. Cannot be expressed as a fraction
  10. 19. Four equal sides
  11. 21. Longest side of a right triangle
  12. 22. Set of points equidistant from a center
  13. 23. Space occupied by a solid
  14. 24. Measure of rotation
  15. 25. Angle more than 90 degrees
Down
  1. 1. Lines that intersect at right angles
  2. 4. Six-sided polygon
  3. 6. Surface within a boundary
  4. 7. Angle of 180 degrees
  5. 8. Distance around a shape
  6. 12. Eight-sided polygon
  7. 13. Lines that never meet
  8. 14. Three-sided polygon
  9. 18. Angle less than 90 degrees
  10. 20. Without end