Write a function to compute the total length of between all vertices of a regular polygon inscribed in a unit circle. For example, a square in a unit circle would have side length of 
and each of the two diagonals would have a length of 2. Therefore, for 
the total length is 
. In the hexagon below, there are 6 lines of length 1 connecting adjacent points, 3 lines of length 2 connecting opposite points, and 6 lines of length 
connecting points two away; therefore, for 
, the total length is 
.
and each of the two diagonals would have a length of 2. Therefore, for the total length is . In the hexagon below, there are 6 lines of length 1 connecting adjacent points, 3 lines of length 2 connecting opposite points, and 6 lines of length connecting points two away; therefore, for , the total length is . 
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The test suite seems suspicious to me. The length of the diagonals will add up to n, and the length of the edges will never be more than 2*pi*r = 6.28. Where are all the big values coming from?
"Diagonals" was confusing, so I changed the wording and added another example.
Oh, I see. The example of the square led me to believe that "diagonal" meant "diameter". Thanks for the clarification!
I am having precision problems with the first and third assert()'s in test 14. The relative precision on the first is about 1e-10 and it is getting a sum that is different by about 3 units. For the third, the error is much worse because if any of the elements of a() are off by even 1 unit, they don't trigger the isprime() and don''t get included in the sum.
I'm having the same problem as William: all tests pass except for test 14. I'm inclined to blame the test rather than my code (famous last words, I know).
OK, I reduced the number of terms in Test 14, and the three solutions submitted so far work.
Thanks, Chris!