Euclides was a famous Greek mathematician from Alexandria, Egypt. He is known for developing geometry and proving many geometric theorems. Some of his most influential works included the Elements, which was a seminal work in mathematics focusing on geometry and still used in modern mathematics education. He helped establish the foundations of mathematics and developed deductive reasoning as the basis for mathematical thought and proof.

1. Figura 9:
https://www.google.com.br/search?q=euclides&source=lnms&tbm=isch&sa=X&sqi=2&ved
=0ahUKEwi4qZDL3ZPVAhXEQZAKHW4rCyAQ_AUIBigB&biw=1396&bih=624#imgrc=Zh2
8xyFUhh58kM: - acesso em 18/07/17.
Figura 10:
https://www.google.com.br/search?q=euclides&source=lnms&tbm=isch&sa=X&sqi=2&ved
=0ahUKEwi4qZDL3ZPVAhXEQZAKHW4rCyAQ_AUIBigB&biw=1396&bih=624#tbm=isch&
q=museu+de+alexandria+e+euclides&imgrc=02ouo_MzlseZPM: - acesso em 18/07/17.