Geometry Crossword Puzzle

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Across
  1. 2. points that lie on the same line
  2. 5. a triangle with three congruent sides
  3. 7. a triangle with three congruent angles
  4. 13. a theorem whose proof follows directly from another theorem
  5. 14. a triangle with three acute angles
  6. 15. a prism with six square faces
  7. 17. a polygon in which all angles are congruent
  8. 19. a style of proof that uses coordinate geometry and algebra
  9. 20. the distance around a circle
  10. 24. the set of all points outside an angle
  11. 25. the set of all points outside a circle
  12. 28. the same distance from two or more objects
  13. 29. a set with no elements
Down
  1. 1. a statement that is believed to be true
  2. 3. a line drawn in a figure to aid in a proof
  3. 4. each side of the polygon is tangent to the circle
  4. 6. the distance along an arc measured in linear units
  5. 8. a ten-sided polygon
  6. 9. a segment whose endpoints lie on a circle
  7. 10. points that lie on the same plane
  8. 11. marks used on a figure to indicate congruent angles
  9. 12. a polygon in which all sides are congruent
  10. 16. the point around which a figure is rotated
  11. 18. an event made up of two or more simple events
  12. 21. a ray that divides an angle into two congruent angles
  13. 22. the intersection of a three-dimensional figure and a plane
  14. 23. a 12-sided polygon
  15. 26. to correspond exactly; to be identical
  16. 27. having the same size and shape