📐 直角三角形计算器Right Triangle Calculator
输入直角三角形任意两个量（两边或一边一角），求其余边、角、面积、周长和斜边上的高。Enter any two values of a right triangle (two sides, or a side and an angle) to get the other sides, angles, area, perimeter and altitude.
使用说明与常见问题How-to & FAQ
「直角三角形计算器」是什么？What is the Right Triangle Calculator tool?
输入直角三角形任意两个量（两边或一边一角），求其余边、角、面积、周长和斜边上的高。Enter any two values of a right triangle (two sides, or a side and an angle) to get the other sides, angles, area, perimeter and altitude.
如何使用「直角三角形计算器」？How do I use the Right Triangle Calculator tool?
在「直角三角形计算器」中，填写「直角边 a」、「直角边 b」、「斜边 c」、「角 A (°，对边 a)」、「角 B (°，对边 b)」等参数，结果会随输入实时计算并显示在下方。In the Right Triangle Calculator: Fill in "Leg a", "Leg b", "Hypotenuse c", "Angle A (°, opposite a)", "Angle B (°, opposite b)"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「直角三角形计算器」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 Right Triangle Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「直角三角形计算器」免费吗？需要注册吗？Is the Right Triangle Calculator free? Do I need an account?
「直角三角形计算器」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 Right 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.