Ptolemy

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Across
  1. 3. finds a relation between 4 sides and 2 diagonals of a cyclic quadrilateral.
  2. 4. One of the earliest extensive trigonometry tables
  3. 6. an expert in or student of mathematics.
  4. 7. city in egypt where ptolemy lived.
Down
  1. 1. astronomer, geographer, and mathematician
  2. 2. theory that everything goes around the Earth.
  3. 5. astronomical manual.