📍 两点距离/中点/斜率计算器Distance, Midpoint & Slope Calculator
输入平面上两点坐标，计算距离、中点、斜率、倾斜角和直线方程。Distance, midpoint, slope, angle and line equation between two points.
使用说明与常见问题How-to & FAQ
「两点距离/中点/斜率计算器」是什么？What is the Distance, Midpoint & Slope Calculator?
输入平面上两点坐标，计算距离、中点、斜率、倾斜角和直线方程。Distance, midpoint, slope, angle and line equation between two points.
如何使用「两点距离/中点/斜率计算器」？How do I use the Distance, Midpoint & Slope Calculator?
在「两点距离/中点/斜率计算器」中，填写「x₁」、「y₁」、「x₂」、「y₂」等参数，结果会随输入实时计算并显示在下方。In the Distance, Midpoint & Slope Calculator: Fill in "x₁", "y₁", "x₂", "y₂"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「两点距离/中点/斜率计算器」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 Distance, Midpoint & Slope Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「两点距离/中点/斜率计算器」免费吗？需要注册吗？Is the Distance, Midpoint & Slope Calculator free? Do I need an account?
「两点距离/中点/斜率计算器」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 Distance, Midpoint & Slope 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.