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February 21, 2018, 05:10:06 PM
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: Tell me the sides!  ( 3052 )
« : June 18, 2007, 08:59:08 PM From Poonam»



Tell me the sides!


How many sides are there in a polygon which has 66 diagonals?

Alternatively, how many people are there in a party where each person shakes hands with every person and the total number of hand shakes are 66?

 
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« #1 : June 20, 2007, 01:07:05 AM From PSM»

answer is 12 sides....or 12 persons.... 8)
« #2 : July 16, 2007, 11:28:37 PM From Prateek»

Yes 12 is the answer.

The general formula is n*(n+1)/2
« #3 : August 17, 2007, 11:29:49 PM From Shashi»

its n(n-1)/2
: 1
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