Geometry crossword

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Across
  1. 2. Used to direct traffic
  2. 3. In the sky at night
  3. 4. 4 sides
  4. 6. 3d circle
  5. 10. Round
  6. 11. Inside your body
  7. 12. Fun to play with
Down
  1. 1. 3 sides
  2. 2. 3d square
  3. 5. Weird circle
  4. 7. You see it on a turtle
  5. 8. 4 sides but not a square
  6. 9. Shape of the moon