freeCodeCamp/guide/chinese/mathematics/axis-of-symmetry-of-a-parabola/index.md

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---
title: Axis of Symmetry of a Parabola
localeTitle: 抛物线的对称轴
---
## 抛物线的对称轴
抛物线的对称轴是将抛物线完美地平分(或分成两个偶数部分)的线。
这与在抛物线顶点的x值处绘制的垂直线相同。知道这一点你可以通过使用二次抛物线方程的顶点形式轻松找到对称线
y = axh 2 + k
在这种形式中抛物线顶点的坐标由hk给出这意味着对称线的方程将是x = h。