geometry

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Across
  1. 3. a plane figure with eight straight sides and
  2. 5. a four sided plane rectilinear figure with
  3. 7. a quadrilateral with only one pair of parallel
  4. 10. a plane figure with four straight sides and fourright angles, especially one with unequal adjacent
  5. 15. a plane figure with four equal straight sides and four right angles
  6. 16. sides.
  7. 17. a plane figure with nine straight sides and nine
  8. 18. a plane figure with eleven straight sides and
  9. 19. contrast to a square
  10. 21. a plane figure with twelve sides.
Down
  1. 1. is a polygon with 10000 sides.
  2. 2. opposite equal obtuse angles, and four
  3. 4. angles
  4. 6. . a parallelogram with opposite equal acute
  5. 8. angles
  6. 9. a plane figure with six straight sides and
  7. 11. . a plane figure with three straight sides and
  8. 12. a plane figure with seven straight sides and
  9. 13. sides parallel.
  10. 14. a plane figure with nine straight sides and nine
  11. 20. a plane figure with ten straight sides and