DescriptionAngles and sides of a general triangle.png
English: A general Euclidean triangle with vertices A, B, & C. Let α, β, & γ be the half-tangents of the corresponding internal angles and a, b, & c be the lengths of the opposite sides. The three external angles compose to a full turn.
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A general Euclidean triangle with vertices A, B, & C. Let α, β, & γ be the half-tangents of the corresponding internal angles and a, b, & c be the lengths of the opposite sides. The three external angles compose to a full turn.