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单词 Radius
释义

radius


The radius of a circle or sphere is the distance from the center of the figure to the outer edge (or surface.)

This definition actually holds in n dimensions; so 4th and 5th and k-dimensional “spheres” have radii. Since a circle is really a 2-dimensional sphere, its “radius” is merely an instance of the general definition.

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更新时间:2025/5/4 9:28:37