**Be wise, generalise.**
By a diagonal is meant a straight line joining non-adjacent vertices?
n=10.
One vertex Q, chosen as point of concurrency, is joined to remaining
7 non-adjacent vertices of a regular decagon ( n = 10) forming 10 -3 =
7 diagonals.
Narasimham
I am not getting your solution.Send a diagram.Any n which is multiple of 30 will have this property.So least value
will be 30.
Regards from Sujeet
May be a trivial or extreme solution. If a JavaSketchPad drawn with
all 5 radial lines as diagonals concurring at center of n =10 decagon
and then if center is dragged to any vertex, a diagram of 7 diagonals
would form as in:
http://i51.tinypic.com/2ibnapv.jpg
Regards,
Narasimham
Q was supposed to be in the interior of polygon