geometry

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