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Acute Problem
Forfatter
Lamberto Lamberti
PROPOSITION: There do not exist four distinct points A,B,C,D on the plane such that the interior angles of the triangles ABC, ABD, ACD, and BCD are all acute.
http://www.mathpages.com/home/kmath311/kmath311.htm
GeoGebra
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Sketching Vector Function (1)
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apec
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คิดเลขเร็ว
Построение параболы по точкам
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Rombe
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