📏 三角形中位线计算器Midsegment of a Triangle Calculator
连接三角形两边中点的中位线平行于第三边且长度为其一半。输入第三边长即可。本地处理。The midsegment joining midpoints of two sides is parallel to the third side and half as long. Enter that third side length. Processed locally.
使用说明与常见问题How-to & FAQ
「三角形中位线计算器」是什么？What is the Midsegment of a Triangle Calculator tool?
连接三角形两边中点的中位线平行于第三边且长度为其一半。输入第三边长即可。本地处理。The midsegment joining midpoints of two sides is parallel to the third side and half as long. Enter that third side length. Processed locally.
如何使用「三角形中位线计算器」？How do I use the Midsegment of a Triangle Calculator tool?
在「三角形中位线计算器」中，填写「第三边长度」等参数，结果会随输入实时计算并显示在下方。In the Midsegment of a Triangle Calculator: Fill in "Third side length"; results are recalculated instantly as you type.
需要三边都填吗？Do I need all three sides?
不需要。中位线长度只取决于它所平行的那条边。No. The midsegment length depends only on the side it is parallel to.
坐标怎么求？What about coordinates?
本页只给长度关系；中点坐标是两端点平均。This page is the length relation only; a midpoint is the average of its endpoints.
能举个计算实例吗？Can you show a worked example?
例如在「三角形中位线计算器」中填 第三边长度 = 10，结果区显示：中位线长度：5For example, entering Third side length = 10 in the Midsegment of a Triangle Calculator gives: Midsegment length: 5
哪些输入会被检查？Which inputs are validated?
「三角形中位线计算器」会检查这些输入——「第三边长度」：必须填写，须大于 0且不大于 1,000,000,000,000,000；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Midsegment of a Triangle Calculator checks its inputs — "Third side length": required, must be more than 0 and at most 1,000,000,000,000,000; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「三角形中位线计算器」的设置：「第三边长度」默认 10。每次生成结果都按当前设置处理。Settings in the Midsegment of a Triangle Calculator — "Third side length" default 10. The result always uses the current settings.
计算精度如何？How precise are the results?
「三角形中位线计算器」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 Midsegment of a Triangle Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「三角形中位线计算器」免费吗？需要注册吗？Is the Midsegment of a Triangle Calculator free? Do I need an account?
「三角形中位线计算器」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 Midsegment of a Triangle 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.