Parts of a flower

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Across
  1. 3. is the cross puzzle without numbers:
  2. 4. The points where two sides of a polygon intersect.
  3. 8. A polygon with four sides.
  4. 10. A polygon with at least one interior angle greater than 180 degrees.
  5. 12. The straight edges of a polygon.
  6. 13. A line segment connecting two non-adjacent vertices of a polygon.
Down
  1. 1. The total distance around a polygon.
  2. 2. A polygon with all sides and angles equal.
  3. 5. A polygon with all sides of equal length.
  4. 6. A polygon with six sides.
  5. 7. The corners where two sides of a polygon meet.
  6. 9. A polygon with five sides.
  7. 11. A polygon where all interior angles are less than 180 degrees.