Greek and Latin roots unit 14/15

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Across
  1. 2. a sixth of a circle and instrument used to determine the position of a length
  2. 6. a person who is between the age of 70--79 years old
  3. 8. a flat shape that has eight sides and eight angles
  4. 9. a group of seven singers or musicians who performs together
Down
  1. 1. the tenth month of the year formerly the eighth
  2. 3. a group of eight such as eight lines or eight musical notes
  3. 4. lasting for seven years happening once every seven years
  4. 5. a 2-dimensional figure that has six sides and six angles
  5. 7. the ninth month of the year formerly the seventh
  6. 8. a sea animal that has a soft body and eight long arms