Tri and quad

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