Prefix tri- (three)

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Across
  1. 3. a three-sided figure
  2. 5. to cut into three parts
  3. 8. a vehicle with three wheels
Down
  1. 1. having,or involving three countries or parties
  2. 2. a dinosaur with three horns
  3. 3. a group of three people or things
  4. 4. three related plays or novels
  5. 5. a race that combines three activities
  6. 6. a three-legged stool, table, or stand
  7. 7. able to speak three different languages