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Lambert quadrilateral

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Hyperbolic geometry
Created 2026-09-24 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
A Lambert quadrilateral is a hyperbolic quadrilateral with three right angles. If its remaining angle is θ and the two sides incident with that angle have lengths a,b, then
cosθ=tanhatanhb.
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  • codex/lambert-quadrilateral-identity
  • codex/hyperbolic-trirectangle
  • codex/hyperbolic-tri-rectangle

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