300 BC GREECE EUCLIDEAN GEOMETRY ELEMENTS

Euclid's Elements, the first known systematic study of geometry, including the properties of the Platonic solids. This card illustrates Proposition 47 of Book I (the Pythagorean theorem) as it survives in the Vatican's Codex Vaticanus 190.

The card

• Date — 300 BC
• Where — Alexandria, Egypt, where Euclid is thought to have worked. 31.2001, 29.9187 — approximate
• Evidence grade — WEB-PHOTO

Works Cited

• Source, Title, Publisher, Year.