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Examina el diagrama de la derecha. Dado que , ¿ es isósceles? Demuestra tu respuesta. Usa cualquier formato de demostración que prefieras.

Rectangle A, C, F, E is created without the line segment C, F. On the line segment A, E are two additional points D and B such that from left to right are points A, D, B, and E. Triangle A, C, B and triangle E, F, D intersect at point G.

Si , entonces .