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Euclid

Statue of Euclid, at Oxford Museum of Natural History
Illustration of the most famous theorem in Euclid, Pythagoras' theorem: the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides
Euclid's Elements Book III, Proposition 35: "If in a circle two straight lines cut one another, then the rectangle contained by the segments of the one equals the rectangle contained by the segments of the other"

Euclid of Alexandria (Greek: Εὐκλείδης) (about 325 BC–265 BC) was a Greek mathematician who lived in Alexandria, Egypt and worked at the Library of Alexandria. Little is known about this person, but people think he lived there when Ptolemy I was Pharaoh. It is not known where and when he was born.

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