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("Ptolemy

Ptolemy

name

Claudius Ptolemaeus (c. 90 – c. 168 AD), a Greek-speaking mathematician, geographer, astronomer, and astrologer who lived in the Hellenistic culture of Alexandria in Roman Egypt. His most important works were the Almagest and the Geography

Ptolemy was a famous astronomer in ancient Greece.

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Ptolemies

name

The Ptolemaic dynasty.

The Ptolemies ruled over Egypt for nearly three centuries.

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Ptolemy's theorem

name

(geometry) A theorem that states in a cyclic quadrilateral, the product of the lengths of its diagonals is equal to the sum of the products of the lengths of the two pairs of opposite sides.

Ptolemy's theorem is a mathematical theorem named after the Greek mathematician Ptolemy.

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