“Placing your stick at the end of the shadow of the pyramid, you made by the sun's rays two triangles, and so proved that the pyramid [height] was to the stick [height] as the shadow of the pyramid to the shadow of the stick.”

— Thales

W. W. Rouse Ball, A Short Account of the History of Mathematics (1893, 1925)

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Thales 9

ancient Greek philosopher and mathematician -624–-547 BC

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