Paulus Gerdes
Paulus Gerdes, African Pythagoras. A Study in Culture and Mathematics Education. Maputo, Instituto Superior Pedagogico, Mocambique 1994.
Let ABC be a triangle, P = G = X(2) and Q a point on the Euler line. Denote: Bc, Cb = the orthogonal projections of B, C on GC, GB, resp. ...
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