Geometrical shapes

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Across
  1. 4. angle more than 90 degrees
  2. 7. any of the line segments from its center to its perimeter
  3. 8. a quadrilateral with both pairs of opposite sides parallel and all sides the same length
  4. 12. a line that goes up and down
  5. 14. angle less than 90 degrees
  6. 15. a polygon with 9 sides
  7. 16. 4 sided shape
  8. 18. formed when two straight lines or rays meet at a common endpoint
  9. 19. a polygon with 10 sides
  10. 20. measure less than 90 degrees
Down
  1. 1. a polygon with 6 sides
  2. 2. a polygon with 5 sides
  3. 3. the length of the line through the center that touches two points on the edge of the circle
  4. 5. all sides and angles are congruent
  5. 6. a quadrilateral with two pairs of parallel sides
  6. 9. a polygon with 8 sides
  7. 10. angle that is 90 degrees
  8. 11. something lying or moving in the same direction but always the same distance apart
  9. 13. no sides or angles are congruent
  10. 17. having two sides of equal length.