⭕ 圆计算器Circle Calculator

使用说明与常见问题How-to & FAQ

「圆计算器」是什么？What is the Circle Calculator?

输入半径、直径、周长或面积中的任意一个，计算圆的其余参数。Enter radius, diameter, circumference or area to get the rest.

如何使用「圆计算器」？How do I use the Circle Calculator?

在「圆计算器」中，填写「数值」、「已知」等参数，结果会随输入实时计算并显示在下方。In the Circle Calculator: Fill in "Value", "Given"; results are recalculated instantly as you type.

计算精度如何？How precise are the results?

「圆计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Circle Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.

「圆计算器」免费吗？需要注册吗？Is the Circle Calculator free? Do I need an account?

「圆计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Circle Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.