Tri and quad

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Across
  1. 2. to cut into three parts
  2. 6. a plane figure in geometry that has four sides
  3. 7. one out of four equal parts of a circle
  4. 8. a three-legged stool
  5. 9. a three sided figure
Down
  1. 1. a collection or group of four
  2. 3. a vehicle with three wheels
  3. 4. an animal with four feet
  4. 5. a group of three
  5. 6. to cut or divide into four equal parts