📐 不等边三角形计算器（海伦面积）Scalene Triangle Calculator (Heron Area)
由三边判定是否不等边（三边两两不等），并用海伦公式求面积与周长。须满足三角不等式。本地处理。Checks whether all three sides differ (scalene) and finds area by Heron plus the perimeter. Must satisfy the triangle inequality. Processed locally.
使用说明与常见问题How-to & FAQ
「不等边三角形计算器（海伦面积）」是什么？What is the Scalene Triangle Calculator (Heron Area) tool?
由三边判定是否不等边（三边两两不等），并用海伦公式求面积与周长。须满足三角不等式。本地处理。Checks whether all three sides differ (scalene) and finds area by Heron plus the perimeter. Must satisfy the triangle inequality. Processed locally.
如何使用「不等边三角形计算器（海伦面积）」？How do I use the Scalene Triangle Calculator (Heron Area) tool?
在「不等边三角形计算器（海伦面积）」中，填写「边 a」、「边 b」、「边 c」等参数，结果会随输入实时计算并显示在下方。In the Scalene Triangle Calculator (Heron Area): Fill in "Side a", "Side b", "Side c"; results are recalculated instantly as you type.
有两边相等会怎样？What if two sides are equal?
不等边三角形（scalene）要求三边都不相等。如果有两边相等，它就是等腰三角形，页面会给出相应的分类；面积仍可用海伦公式计算。A scalene triangle needs all three sides different. If two sides are equal it is isosceles, and the page classifies it that way; the area still comes from Heron's formula.
能举个计算实例吗？Can you show a worked example?
例如在「不等边三角形计算器（海伦面积）」中填 边 a = 6，边 b = 7，边 c = 8，结果区显示：是否不等边：是；面积（海伦）：20.333163；周长：21For example, entering Side a = 6, Side b = 7, Side c = 8 in the Scalene Triangle Calculator (Heron Area) gives: Scalene?: Yes; Area (Heron): 20.333163; Perimeter: 21
哪些输入会被检查？Which inputs are validated?
「不等边三角形计算器（海伦面积）」会检查这些输入——「边 a」、「边 b」、「边 c」：必须填写，须大于 0；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 Scalene Triangle Calculator (Heron Area) checks its inputs — "Side a", "Side b", "Side c": required, must be greater than 0; 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?
「不等边三角形计算器（海伦面积）」的设置：「边 a」默认 6；「边 b」默认 7；「边 c」默认 8。每次生成结果都按当前设置处理。Settings in the Scalene Triangle Calculator (Heron Area) — "Side a" default 6; "Side b" default 7; "Side c" default 8. The result always uses the current settings.
计算精度如何？How precise are the results?
「不等边三角形计算器（海伦面积）」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 Scalene Triangle Calculator (Heron Area) uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「不等边三角形计算器（海伦面积）」免费吗？需要注册吗？Is the Scalene Triangle Calculator (Heron Area) free? Do I need an account?
「不等边三角形计算器（海伦面积）」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 Scalene Triangle Calculator (Heron Area) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.