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  "body": "\n## Definition\n\nLet $ABCD$ be a convex quadrilateral in an [[absolute plane|VKFPCSRNDH]].\nIt is a *Lambert quadrilateral* if three of its [[angles|0GJAJC6TNZ]], say $\\angle DAB$, $\\angle ABC$ and $\\angle BCD$, are right angles.\n\n## Remarks\n\nExample: in $\\R^2$, the rectangle with vertices $(0,0)$, $(3,0)$, $(3,1)$, $(0,1)$ is a Lambert quadrilateral, since all four of its angles are right.\nNon-example: the quadrilateral with vertices $(0,0)$, $(2,0)$, $(2,1)$, $(0,3)$ has right angles at $(0,0)$ and $(2,0)$ only, so it is not a Lambert quadrilateral.\nThe fourth angle $\\angle CDA$ is right in the Euclidean plane and acute in the hyperbolic plane.\n",
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    "name": "Lambert quadrilateral",
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  "name": "Lambert quadrilateral",
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