Chapter One

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Across
  1. 2. geometric element that is a location only
  2. 6. two-dimensional figure in a plane bounded by line segments
  3. 8. sum of the lengths of all sides
  4. 10. tool used for drawing circles and arcs
  5. 11. from Greek words for "earth" and "measure"
  6. 12. tool for drawing line segments
  7. 14. Euclid described it as a "breadthless length" that extends without end in both directions
  8. 15. tool for measuring the degrees in an angle
  9. 19. man who first presented geometry as a logical system of connected ideas
  10. 20. point where two lines meet
  11. 23. pair of rays that have the same endpoint
  12. 24. title of book written by Euclid circa 600 B.C.
  13. 25. points that are contained by the same line
  14. 27. the shared endpoints of two rays that form an angle
  15. 29. type of reasoning based on observations
  16. 30. part of a line bounded by two endpoints
  17. 31. geometric drawings
Down
  1. 1. polygon bounded by four sides
  2. 3. points that are not contained by any single line
  3. 4. points that are contained in the same plane
  4. 5. word
  5. 7. lines that contain the same point
  6. 9. part of a line that extends endlessly in one direction
  7. 11. type of reasoning based on logic
  8. 13. distance between the center of a circle and any point on it
  9. 15. three-dimensional figure in space bounded by polygons
  10. 16. polygon bounded by eight sides
  11. 17. polygon bounded by five sides
  12. 18. polygon bounded by three sides
  13. 21. set of all points in a plane that are a fixed distance from a given point in the plane
  14. 22. flat unbounded surface
  15. 26. the number of unit squares equal in measure to its surface
  16. 28. polygon bounded by six sides