How many diagonals are there in a decagon – InterviewSolution

InterviewSolution

1.

How many diagonals are there in a decagon

Answer»

Formula for calculating number of diagonals of any polygon of n sides = n*(n - 3)/2

So here it's a decagon ,that is a 10 sided polygon, So n = 10.

Simply plug value of n into the formula , you get: 10*(10-3)/2 = 35.

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