ahan has enlightened you with cool words

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Across
  1. 4. a figure in geometry that has 4 sides
  2. 5. a muscle group containing 4 muscles
  3. 7. a collection or group of four (like babies)
  4. 10. three-sided figure
  5. 11. to cut into 4 equal parts
  6. 12. a race that combines three activities-swimming, bicycling, and running
  7. 14. a group of 3
  8. 15. animal with 4 feet
  9. 16. having or involving 3 sides
  10. 17. a vehicle that contains 3 wheels
Down
  1. 1. happening every 4 years
  2. 2. to create 4 times the amount of something
  3. 3. a 3 legged stand
  4. 5. the ability to speak 4 languages
  5. 6. 3 related plays of novels
  6. 7. one of 4 parts of a circle: one section of a coordinate grid
  7. 8. able to speak 3 languages
  8. 9. to cut into 3 parts
  9. 12. dinosaur with three horns-two long horns on the head and one small one on the nose
  10. 13. a 4 sided enclosure