Ready for Billiard-style Mathematics?

Geometry Level 3

\(15\) billiard balls are lying on a table in such a way that they are just crammed inside an equilateral triangular frame in a neat and perfect manner. Given that the frame's perimeter is \(876mm\), determine the radius of a single billiard ball.


  1. Record your answer in millimetres.

  2. Answer can be given up to \(3\) decimal places.

  3. You may use a calculator to evaluate the final expression of the answer.


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