English: Diagram illustrating the pons asinorum (Euclid, Elements, Book I): in an isosceles triangle, the base angles α and β are equal, and the exterior angles γ and δ, formed by extending the equal sides beyond the base, are also equal.
Français : Schéma illustrant le pons asinorum (Euclide, Éléments, Livre I) : dans un triangle isocèle, les angles à la base α et β sont égaux, et les angles extérieurs γ et δ, formés en prolongeant les côtés égaux au-delà de la base, le sont également.
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Diagram illustrating the ''pons asinorum'' (Euclid, ''Elements'', Book I): in an isosceles triangle, the base angles α and β are equal, and the exterior angles γ and δ, formed by extending the equal sides beyond the base, are also equal.
Schéma illustrant le ''pons asinorum'' (Euclide, ''Éléments'', Livre I) : dans un triangle isocèle, les angles à la base α et β sont égaux, et les angles extérieurs γ et δ, formés en prolongeant les côtés égaux au-delà de la base, le sont également.