Polygon Crossword Puzzle

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Across
  1. 2. At least one inside angle is more than 180 degrees.
  2. 4. A polygon that does not cross over itself.
  3. 6. A triangle where all interior angles measure less than 90 degrees.
  4. 8. A polygon that has 9 sides.
  5. 10. A shape commonly found in honeycombs.
  6. 11. The total distance around the boundary of a polygon.
  7. 15. A polygon that has 10 sides.
  8. 16. A shape that has only one pair of parallel sides.
  9. 18. A polygon that has 3 sides.
  10. 19. A polygon that has 5 sides.
  11. 20. A polygon that has 7 sides.
Down
  1. 1. A polygon with as many sides as there are months in a year.
  2. 3. The shape of a STOP sign.
  3. 5. A polygon that has 4 sides.
  4. 7. A shape that has odd sides and angle lengths.
  5. 9. A triangle that has one angle measuring more than 90 degrees.
  6. 12. The inside angles are less than 180 degrees.
  7. 13. A self-intersecting polygon that does not follow simple boundary rules.
  8. 14. A closed shape consisting of at least three straight sides.
  9. 17. All sides have the same length.