RRB Group D 19-Sep-2018 Shift 1 Solved Paper

Question : 14 of 100

Marks: +1, -0

The number of diagonals in a 27-sided polygon is

Solution:

Number of diagonals of polygon of n-side

=\;{ {n}( {n}-3)}/{2}

{n}=27

Diagonals

=\;{27(27-3)}/{2}=\;{27 × 24}/{2}=324

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