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the triangle ABC be applied to the triangle DEF,
and if
the point B be placed on the point E and the straight line BC on EF,
the point C will also coincide with F, because BC is equal to EF.
Then, BC coinciding with EF,
the base BC coincides with the base EF, and the sides BA, AC do not coincide with ED, DF but fall beside them as EG, GF,
