Math crossword

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Across
  1. 3. a polygon with 6 sides
  2. 6. a polygon with 5 sides
  3. 8. a reference to or designating the age from 90 to 99 years old
  4. 10. a group or series of three related things
  5. 13. a period of three months especially during pregnancy
Down
  1. 1. tenth month of the year
  2. 2. a polygon with three sides
  3. 4. a 5 pointed star that is formed by drawing a continues line
  4. 5. a polygon with 10 sides
  5. 6. a line or verse consisting 5 metrical feet
  6. 7. a polygon with 9 sides
  7. 9. a poem consisting of four lines specific rhyming scheme
  8. 11. any octopod with eight sucker-bearing arms
  9. 12. a period of ten years