Euclid Book 1 - Proposition 8
Congruent triangles if all three sides are equal

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To be proved: If two triangles have the two sides equal to two sides respectively, and also have the base equal to the base, then they also have the angles equal which are contained by the equal straight lines.

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There are two triangles ABC and DEF where lines AB = DE, AC = DF and BC = EF

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