Across
- 3. Inventor of natural logarithms.
- 5. Given credit for the famous a^2+b^2=c^2 theorem.
- 6. Developed first detailed trigonometry tables.
- 7. The father of geometry.
Down
- 1. First to write numbers in Hindu-Arabic decimal system.
- 2. Father of Algebra.
- 4. First computer programmer.
- 5. Known for platonic solids.