Polygons

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Across
  1. 4. I have 9 sides and 9 corners.
  2. 6. Most doors are shaped like me.
  3. 8. I am a polygon with 11 sides.
  4. 10. I have 4 equal sides and 4 equal corners.
  5. 11. I am a polygon with 7 sides.
Down
  1. 1. A stop sign is shaped like me.
  2. 2. I am a polygon with 12 sides.
  3. 3. I am a polygon with 3 sides and 3 corners.
  4. 5. I am a polygon with 10 sides.
  5. 7. My name starts with "penta," meaning five.
  6. 9. Honeycomb cells are shaped like me.