📐 45-45-90 三角形45-45-90 Triangle Calculator
斜边 = 腿 × √2。可设置「已知」、「长度」。hyp = leg × √2. Settings: Given, Length.
使用说明与常见问题How-to & FAQ
「45-45-90 三角形」是什么？What is the 45-45-90 Triangle Calculator tool?
斜边 = 腿 × √2。可设置「已知」、「长度」。hyp = leg × √2. Settings: Given, Length.
如何使用「45-45-90 三角形」？How do I use the 45-45-90 Triangle Calculator tool?
在「45-45-90 三角形」中，填写「已知」、「长度」等参数，结果会随输入实时计算并显示在下方。In the 45-45-90 Triangle Calculator: Fill in "Given", "Length"; results are recalculated instantly as you type.
三个角各是多少度？What are the angles?
45-45-90 三角形是等腰直角三角形：两个锐角都是 45°，另一个是 90°。两条直角边相等，斜边 = 直角边 × √2 ≈ 1.414 × 直角边。A 45-45-90 triangle is an isosceles right triangle: two 45° angles and one 90°. The legs are equal and the hypotenuse = leg × √2 ≈ 1.414 × leg.
能举个计算实例吗？Can you show a worked example?
例如在「45-45-90 三角形」中填 已知 = 直角边，长度 = 10，结果区显示：直角边：10；斜边：14.142136；面积：50For example, entering Given = Leg, Length = 10 in the 45-45-90 Triangle Calculator gives: Leg: 10; Hypotenuse: 14.142136; Area: 50
哪些输入会被检查？Which inputs are validated?
「45-45-90 三角形」会检查这些输入——「长度」：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 45-45-90 Triangle Calculator checks its inputs — "Length": 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?
「45-45-90 三角形」的设置：「已知」可选 直角边、斜边（默认 直角边）；「长度」默认 10。每次生成结果都按当前设置处理。Settings in the 45-45-90 Triangle Calculator — "Given": Leg, Hypotenuse (default Leg); "Length" default 10. The result always uses the current settings.
计算精度如何？How precise are the results?
「45-45-90 三角形」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 45-45-90 Triangle Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「45-45-90 三角形」免费吗？需要注册吗？Is the 45-45-90 Triangle Calculator free? Do I need an account?
「45-45-90 三角形」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 45-45-90 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.