Pseudosphere Calculator
Free online pseudosphere calculator. Enter your values and get instant results with the formula, step-by-step working, a worked example and FAQs — everything runs locally in your browser on Calcton, no signup required.
中文版：伪球面在线计算器
原理：把曳物线（tractrix）x = a(t − tanh t)、y = a·sech t 绕其渐近线旋转，得到伪球面。由于 ds = a·tanh t·dt，面积与体积都可积出闭式。
步骤：输入参数 a，直接读取闭式结果并与同半径球面对照。
示例：a = 1 时 S = 12.566370614359（与单位球相等）、V = 2.094395102393（恰为同球体积之半）。
注意事项：伪球面上高斯曲率处处为 −1/a²，是双曲几何（罗巴切夫斯基几何）的局部模型；但它只能局部实现双曲平面，整体拓扑与双曲平面不同。
参考值：S(1) = 12.566370614359；V(1) = 2.094395102393；sech(0) = 1、sinh(1)·cosh(1) = 1.813430203923。
How to use the Pseudosphere Calculator
- Fill in the inputs with your own numbers — every field shows what it expects.
- The result updates instantly as you type; no "Calculate" click needed.
- Read the result card for the main figure, the step-by-step formula, and practical notes.
Frequently asked questions
Is the Pseudosphere Calculator free?
Yes — all math calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.
Is there a Chinese version of this tool?
Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.
References
Formulas and benchmarks used by this calculator follow these published sources.
KevinContent LeadCalcton Editorial Team · Last updated 2026-10-01
Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.
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