File:Circle-withsegments.svg · Wikimedia Commons · See Wikimedia Commons

EntityQ17278· pop 158· linked from 1,019 articles

圓

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Also known as round shape, 1-sphere, circle line, non-filled circle

同一平面上，到定點的距離等於定長的所有點的集合

AI overview

A circle is a perfectly round shape made up of all points that sit at the same distance from a central point, called the radius. Circles are fundamental geometric shapes that appear throughout mathematics, nature, and everyday life, making them essential for understanding everything from engineering and astronomy to art and design.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Polygon.name: Circle
Polygon.image: Circle-withsegments.svg
Polygon.caption: A circle
Polygon.symmetry: Orthogonal group|
Polygon.type: Conic section

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Wikidata facts

Instance of: sign
Subclass of: curve of constant width
Part of: disk
Image: Ellipsoid circular sections.gif

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different from: ه
Commons category: Circle geometry
Unicode character: 🔿
Stack Exchange tag: stackoverflow.com/tags/circle
topic's main category: Category:Circles
described by source: Encyclopædia Britannica 11th edition
has characteristic: roundness
Euler characteristic: 0
Commons gallery: Circle geometry
P8168: Aillon-le-Vieux
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
maintained by WikiProject: WikiProject Mathematics
studied by: Euclidean geometry

Sources (2)

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Article · 中文

圆（拉丁語：circulus，英語：circle），根據歐幾里得的《几何原本》定義，是在同一平面内到定点的距离等于定长的点的集合。圆的第二定义是：平面内一动点到两定点的距离的比，等于一个不为1的常数，则此动点的轨迹是圆；此圆属于（circles of Apollonius）。

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