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Is there any formula to calculate the no of diagonals of a polygon of n side?if there please explain how to derive it. Please..

Asked by 1st October 2013, 9:03 PM
Answered by Expert
to form a side two points are necessary,so we need to select two points out of n points two form a line here
in n side polygon total number of lines formed =nc2
these lines will consist diagonals+sides
number of sides=n
so number of diagonals=nc2-n
                                 ={n(n-1)/2} - n
Answered by Expert 2nd October 2013, 12:46 AM
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