Euclid Book 1 - Proposition 25
Two triangles, two sides same, other sides different

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To be proved: If two triangles have two sides equal to two sides respectively, but have the base greater than the base, then they also have the one of the angles contained by the equal straight lines greater than the other.

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There are triangles ABC and DEF with lines AB = DE, AC = DF, BC > EF

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© Jo Edkins 2010 - Return to Euclid index