tri

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Across
  1. 2. cut in three parts
  2. 5. a vehicle with three wheels that is moved by foot pedals
  3. 9. an athletic contest consisting of three different events (typically running, swimming, and cycling)
  4. 10. a three-sided polygon
Down
  1. 1. huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill
  2. 3. having three sides or parties
  3. 4. using or knowing three languages
  4. 6. a set of three similar things considered as a unit; three performers or singers who perform together
  5. 7. a set of three literary or dramatic works related in subject or theme
  6. 8. a three-legged rack used for support