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.
"A Short Account of the History of Mathematics". Book by W. W. Rouse Ball, 1893.
![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](http://cdn.quoteddaily.com/images/thales/placing-your-stick-at-the-end-of-the-shadow-of-the-pyramid-you-made-by-the-suns-rays-two-triangles.jpg)