In geometry, a Robbins pentagon is a cyclic pentagon whose side lengths and area are all rational numbers. == History == Robbins pentagons were named by Buchholz and MacDougall after David P. Robbins, who had previously given a formula for the area of a cyclic pentagon as a function of its edge lengths.
In geometry, a Robbins pentagon is a cyclic pentagon whose side lengths and area are all rational numbers. == History == Robbins pentagons were named by Buchholz and MacDougall after David P. Robbins, who had previously given a formula for the area of a cyclic pentagon as a function of its edge lengths.
Source: Wikipedia "Robbins pentagon" · CC BY-SA 4.0
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