Tri + Quad

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Across
  1. 5. Able to speak four languages
  2. 6. A three legged stool or table or used to hold a camera
  3. 10. A dinosaur with three horns
  4. 13. Three related story's or plays
  5. 15. Every four years
  6. 17. A three sport race
  7. 18. Able to make four times as much as something
Down
  1. 1. A three sided shape in geometry
  2. 2. A collection of a group of four one of four babies born at the same time and moment
  3. 3. A group of three
  4. 4. A four sided enclosure
  5. 7. Vehicle with three wheels
  6. 8. Involving three sides
  7. 9. To cut into three parts
  8. 11. A plane figure in geometry made of four sides
  9. 12. A animal with four feet
  10. 14. to speak three languages
  11. 15. Able to divide four equal pieces
  12. 16. A mussel group made of four mussels
  13. 18. One of four parts in a circle or a part of a four quadrant grid