Prefix quad-

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Across
  1. 6. a plane figure in geometry that has four sides
  2. 9. the ability to speak four languages
  3. 10. a four sided enclosure
Down
  1. 1. to cut into four even parts
  2. 2. a muscle group in your upper thigh
  3. 3. a collection of four babies born at the same time
  4. 4. to make four times as much
  5. 5. and animal with four feet
  6. 7. one section of a four section coordinate grid
  7. 8. Olympics