Geometry Crossword Puzzle

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Across
  1. 1. Ten-sided polygon
  2. 8. The space inside of a shape
  3. 10. A closed 2D shape formed by three or more straight lines
  4. 11. A pair of opposite and congruent angels formed by intersecting lines
  5. 14. A line segment whose endpoints are the center of a circle and any point on the circle
  6. 15. A point that lies in the middle of a circle
  7. 19. Eight-sided polygon
  8. 20. Seven-sided polygon
  9. 21. Six-sided polygon
Down
  1. 2. Two angles that share a side and vertex
  2. 3. The distance around the outside of a circle
  3. 4. Four sided polygon
  4. 5. Three sided polygon
  5. 6. Five-sided polygon
  6. 7. Two angles whose measures have a sum of 90 degrees
  7. 9. Two angles whose measures have a sum of 180 degrees
  8. 12. The ratio of the circumference to the diameter of any circle, represented either by the symbol π, or the approximation 3.14
  9. 13. An angle that measures 90 degrees
  10. 16. A line segment goes across a circle, through the center
  11. 17. Nine-sided polygon
  12. 18. A line segment whose endpoints are any two points on a circle