Spherical triangle

Japanese: 球面三角形 - きゅうめんさんかくけい
Spherical triangle
A spherical figure enclosed by the arcs of three great circles. The congruence theorem and other rules hold true in the same way as for a plane triangle, but the sum of the interior angles is always greater than two right angles. [Engineering Vocabulary (1886)]

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 三つの大円の弧で囲まれた球面上の図形。平面上の三角形と同様に合同の定理などが成立するが、内角の和は常に二直角より大きい。〔工学字彙(1886)〕

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