par 1.2 rectangle and square

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Across
  1. 3. lines that cross with right angle
  2. 5. where 2 sides meet
  3. 9. figure with 4 sides, 2 pair of equal parallel sides
  4. 10. length of figure
  5. 12. line between 2 vertices that are not neigbours
  6. 14. squared paper
  7. 17. from up to down
  8. 18. 2D shape with 5 vertices
  9. 19. from left to right
Down
  1. 1. figure with 4 sides
  2. 2. flat
  3. 3. 2 lines with same direction
  4. 4. line with one end point
  5. 6. all types of 2D shapes
  6. 7. line between 2 points
  7. 8. cross
  8. 11. an agreement
  9. 13. figure with 4 equal perpendicular sides
  10. 15. 3D shape
  11. 16. 2D shape with 6 vertices