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如何找到圆心

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在求解圆的周长或面积等基础几何题时，通常需要找到一个圆的圆心。阅读本文，了解如何只使用圆规和直尺来找到圆心。

方法 1

方法 1 的 2:

画一个圆并标注相应的点

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几何圆规用于绘制和测量圆，在大多数零售商店有售。
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可在圆的顶部、底部及其他任意位置画水平线。
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方法 2

方法 2 的 2:

找圆心

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确保两个圆部分重叠，类似于韦恩图。
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{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/c\/ca\/Find-the-Center-of-a-Circle-Step-6.jpg\/v4-460px-Find-the-Center-of-a-Circle-Step-6.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/ca\/Find-the-Center-of-a-Circle-Step-6.jpg\/v4-728px-Find-the-Center-of-a-Circle-Step-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}
{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/9\/90\/Find-the-Center-of-a-Circle-Step-7.jpg\/v4-460px-Find-the-Center-of-a-Circle-Step-7.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/90\/Find-the-Center-of-a-Circle-Step-7.jpg\/v4-728px-Find-the-Center-of-a-Circle-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}

分别以上图中所示的 C 点和 D 点为圆心，用圆规画两个大小相同的圆，即分别以垂线与主圆相交的两点为圆心。
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此即第二条直径。
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小提示

用绘图纸画图更方便。

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警告

为了找到圆的真实圆心，您必须使用几何圆规和直尺。
直尺与刻度尺不一样，刻度尺上标注有刻度。

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你需要准备

铅笔
纸
直尺
几何圆规

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参考

圆的有关属性

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