|Book I Proposition 26|
Let ABC, DEF be two triangles having the two angles ABC, BCA equal to the two angles
DEF, EFD respectively, namely
the angle ABC to the angle DEF,
the angle BCA to the angle EFD;
and let them also have one side equal to one side, first (let it be) that adjoining the equal angles, namely
BC to EF.
I say that they will also have the remaining sides equal to the remaining sides respectively, namely AB to DE and AC to DF, and the remaining angle to the remaining angle, namely the angle BAC to the angle EDF.
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