Glenn T. Vickers,
The 19 congruent Jacobi triangles,
Forum Geometricorum, 16
(2016) 339--344.
Abstract. With a given triangle and three angles, Jacobi's theorem involves the construction of a new triangle. An investigation
into the case when these two triangles are congruent is presented. It is claimed that there are always nineteen possibilities
and that they fall into four distinct classes.
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