mono-bi-tri

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Across
  1. 2. sides and angles of triangles
  2. 3. complete control over a product in a given area
  3. 4. a long speech given by a single speaker.
  4. 6. happening every three years
  5. 8. to cut or split into equal parts
  6. 9. a group of three literary or musical works
Down
  1. 1. happening every two years
  2. 3. speech with no change of tone
  3. 5. having two legislative branches or chambers
  4. 7. having two parts or components