Back ثيودورس القوريني Arabic Kirenalı Feodor Azerbaijani Teodor de Cirene Catalan Theodoros von Kyrene (Mathematiker) German Θεόδωρος ο Κυρηναίος Greek Teodoro de Cirene Spanish Theodoros Kyreneläinen Finnish Théodore de Cyrène French Teodoro de Cirene Galician Teodoro di Cirene (matematico) Italian
Theodorus of Cyrene (Greek: Θεόδωρος ὁ Κυρηναῖος, translit. Theódōros ho Kyrēnaîos) was an ancient Greek mathematician who lived during the 5th century BC. The only first-hand accounts of him that survive are in three of Plato's dialogues: the Theaetetus, the Sophist, and the Statesman. In the former dialogue, he posits a mathematical construction now known as the Spiral of Theodorus.