Geometry Crossword Puzzle

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Across
  1. 1. segment whose endpoints are on the circle
  2. 4. planes: planes that do not intersect
  3. 6. an equation that is true for all allowed values of the variable
  4. 8. formed by two rays with the same endpoint
  5. 9. the point of concurrency of the perpendicular bisectors of the sides of a triangle
  6. 12. polygon with eight sides
  7. 13. a parallelogram with four right angles
  8. 15. a two- dimensional pattern that you can fold to from a three- dimensional figure
  9. 18. polygon with five sides
  10. 19. set of all points in a plane that are a given distance from a given point
Down
  1. 2. angle: an angle whose measure is between 90 and 180
  2. 3. polygon with four sides
  3. 5. polygon with nine sides
  4. 7. polygon with ten sides
  5. 9. an if-then statement
  6. 10. circles: lies in the same plane and have the same center
  7. 11. quadrilateral with two pairs of congruent adjacent sides and no opposite sides congruent
  8. 14. geometric tool used to draw circles and parts of circles
  9. 16. arc: an arc that is smaller than a semicircle
  10. 17. the number of square units enclosed by the figure
  11. 20. polyhedron with six faces, each of which is a square