Small Cyclic Quadrilateral

Geometry Level 5

A B C D ABCD has the smallest perimeter among all cyclic quadrilaterals with integer side lengths and diagonals. Let A B AB be its longest side. There is a semicircle with diameter A B AB which divides all the smaller sides into segments s 1 , s 2 , s 3 , . . . s_1, s_2, s_3, ... all of which have integer lengths.

Find the product of all of these segment lengths.


The answer is 1.

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1 solution

Maria Kozlowska
Nov 2, 2017

Quadrilateral's sides have lengths: 4 , 2 , 3 , 2 4,2,3,2 , diagonals have lengths 4 , 4 4,4 . Semicircle divides smaller sides into segments of length 1 1 .

Very neat result!

Jon Haussmann - 3 years, 7 months ago

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