Euclid

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Across
  1. 1. Geometry in books 1-8
  2. 4. Invented the lever
  3. 7. a²+b²=c²
  4. 8. See 3: Series of _ books
Down
  1. 2. city of scientific and literary scholarship
  2. 3. Most famous work(s)
  3. 5. Profession
  4. 6. King of Euclid's time