An oblique triangle can be calculated using the law of cosines, if all three sides or else one angle and its two adjacent sides are known.

Law of cosines:
a² = b² + c² - 2bc cos alpha
b² = c² + a² - 2ca cos beta
c² = a² + b² - 2ab cos gamma
oblique triangle
Fig.: Fricke, Richter, Schneider, "Der Vermessungstechniker"

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