📐 勾股定理计算器Pythagorean Theorem Calculator
已知直角三角形任意两边，求第三边（a² + b² = c²），以及面积和角度。Find the missing side of a right triangle (a² + b² = c²), plus area and angles.
使用说明与常见问题How-to & FAQ
「勾股定理计算器」是什么？What is the Pythagorean Theorem Calculator?
已知直角三角形任意两边，求第三边（a² + b² = c²），以及面积和角度。Find the missing side of a right triangle (a² + b² = c²), plus area and angles.
如何使用「勾股定理计算器」？How do I use the Pythagorean Theorem Calculator?
在「勾股定理计算器」中，填写「直角边 a」、「直角边 b」、「斜边 c (留一个空)」等参数，结果会随输入实时计算并显示在下方。In the Pythagorean Theorem Calculator: Fill in "Leg a", "Leg b", "Hypotenuse c (leave one blank)"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「勾股定理计算器」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 Pythagorean Theorem Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「勾股定理计算器」免费吗？需要注册吗？Is the Pythagorean Theorem Calculator free? Do I need an account?
「勾股定理计算器」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 Pythagorean Theorem 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.