Polygons

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Across
  1. 3. a polygon with 8 sides
  2. 7. a polygon with 4 sides
  3. 8. a quadrilateral with two pairs of parallel sides
  4. 10. a polygon with 6 sides
  5. 11. a triangle with one angle greater than 90 degrees
  6. 15. a quadrilateral with two pairs of parallel sides and four 90 degree angles
  7. 16. a triangle with all three different side lengths
  8. 18. a triangle with all angles less than 90 degrees
  9. 19. a quadrilateral with at least on pair of parallel sides
  10. 20. a polygon with 9 sides
Down
  1. 1. a quadrilateral with four congruent sides
  2. 2. a triangle with at least two equal sides
  3. 4. a polygon with 3 sides
  4. 5. a polygon with 10 sides
  5. 6. a polygon with 5 sides
  6. 9. a triangle with one 90 degree angle
  7. 12. a triangle with all equal sides
  8. 13. a quadrilateral with two pairs of parallel sides, four congruent side lengths, and four 90 degree angles
  9. 14. a quadrilateral with two pairs of congruent sides
  10. 17. a polygon with 7 sides