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Lambert quadrilateral
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Words: 33
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
cos
θ
=
tanh
a
tanh
b
.
(139)
Ancestors
(5)
Hyperbolic geometry
Geometry and topology
Area of mathematics
Mathematics
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(1)
Lambert quadrilateral identity