Ball crown - Kyukan

Japanese: 球冠 - きゅうかん
Ball crown - Kyukan
The part of a sphere cut by a plane that intersects with it. The solid part enclosed by the crown and the plane of the cut (base) is called a spherical spur. → Sphere / Spherical Geometry / Spherical Trigonometry

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
球面をそれと交わる平面で切りとった部分。球冠と切り口の平面(底面)で囲まれた立体部分を球欠という。→球/球面幾何学/球面三角法

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