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ISRO | ISRO CS 2013 | Question 71

  • Last Updated : 15 May, 2018
Geek Week

How many diagonals can be drawn by joining the angular points of an octagon?
(A) 14
(B) 20
(C) 21
(D) 28

Answer: (B)

Explanation: In an octagon, for each of the 8 vertices, 5 diagonals can be drawn, so total 5 * 8 = 40 diagonals can be constructed. But each diagonal is double counted, so there are 20 diagonals in a regular octagon.

Option (B) is correct.

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