Having high school students prove geometrical propositions became the norm in the United States with the reforms of the 1890's - when geometry was designated as the place for students to learn the ...
(1) CHRISTIAN VON STAUDT'S “Beiträge zur Geometrie der Lage” was published so long ago as 1857; about the year 1871 Felix Klein wrote a series of papers emphasising the fact that it is possible to ...
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