Acute Problem

Auteur :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

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Visualizing the Pythagorean Identity with Sine and Cosine

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Introdução
retake 4
Chord Progressions
Offene Bälle in der komplexen Ebene
Wekstein_Medians in a triangle

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Fonctions Trigonométriques
Inégalités
Probabilité
Rectangle
Vecteurs 3D (Espace)