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[Commentary:
The text referred to here is Johan Philip Triangulorum geometriae libri quatuor (1591). Lansberg's rule for finding a side of a spherical triangles, given its angles, is the final rule in Book 4, on page 201. ]
Datis tribus angulis quaesitur latus. Lansbergi trianguli
[Translation: Given three angles, a side is sought. Solution from Lansberg, Triangulorum ]
[Translation: Given three angles, a side is sought. Solution from Lansberg, Triangulorum ]