
doi: 10.5951/mt.80.7.0580
The problem of determining integer-sided triangles that contain a 60-degree angle was mentioned by R. G. Dearborn (1985), In this article I shall derive some general formulas for resolving this problem; these include Dearborn's result as a special case and have several further ramifications, including a connection with the well-known “SSA ambiguity” in elementary plane geometry.
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