Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 255
244 THE TEACHING OF GEOMETRY A very simple illustration of the use of similar trianglesis found in one of the stories told of Thales. It is re- … lated that he found the height of the pyramids by meas-uring their shadow at the instant when his own shadowjust equaled his height. He thus had the case of twosimilar isosceles triangles. This is an interesting exercisewhich may be tried about the time that pupils are leav-ing school in the…
Geometry
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