A history of Greek mathematics : Heath, Thomas Little, Sir, 1861-1940 : Free Download, Borrow, and Streaming : Internet Archive
Search the history of more than 1 trillion web pages. Capture a web page as it appears now for use as a trusted citation in the future. Please enter a valid web address GEOMETRICAL THEOREMS 131 (5) ' Pamphile says that Thales, who learnt geometry from the Egyptians, was the first to describe on a circle a triangle (which shall be) right-angled (KaTaypdyjraL kvkXov to Tplyoavov opOoycoi/iov), and that he sacrificed an ox (on the strength of the discovery). Others, however, including Apollodorus the calculator, say that it was Pythagoras.' ^ The natural interpretation of Pamphile's words is to suppose that she attributed to Thales the discovery that the angle in a semicircle is a right angle. Taking these propositions in order, we may observe that, when Thales is said to have ' demonstrated ' {dnoSe'i^aL) that a circle is bisected by its dia
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