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with reference to Trilateration using 3 latitude and longitude points, and 3 distances.
The accepted answer was votes as shown in wikipedia in conjunction with a conversion to radians before and after.
Is there a way to incorporate Vincenty's formulae to this process to bring a more accurate answer?
For a discussion of various problems in ellipsoidal trigonometry, see Sections 10 and 11 of http://arxiv.org/abs/1102.1215
Some similar problems are also discussed in http://dx.doi.org/10.1007/s00190-012-0578-z
