Inside the sphere - Inside the sphere

…The line segment or its length connecting the center and a point on the sphere is called the radius, and when the line segment connecting two points on the sphere passes through the center, this line segment or its length is called the diameter. All points whose distance from the center is less than the radius are called the inside of the sphere, and all points whose distance from the center is greater than the radius are called the outside of the sphere. The sphere and its interior together are also called a sphere. …

*Some of the terminology that refers to "the inside of a sphere" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…中心と球面の点を結ぶ線分またはその長さを半径といい，球面の2点を結ぶ線分が中心を通るとき，この線分またはその長さを直径という。中心からの距離が半径より小さい点の全体を球面の内部，大きい点の全体を球面の外部という。球面とその内部を合わせたものも球と呼ばれる。…

※「球面の内部」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報