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.

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Quote text and notes from Wikiquote: Thales (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.