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Question

The number of diagonals that can be drawn by joining the verticles of an octagon is


A

20

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B

28

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C

8

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D

16

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Solution

The correct option is A

20


An octagon has 8 vertices.

The number of diagonals of a polygon is given by n(n3)2

Number of diagonals of an octagon

=8(83)2=20


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