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