The number of diagonals in a octagon is | MATH - DEFINITON OF COMBINATIONS, CONDITION COMBINATIONS, DIVISION INTO GROUPS, DERANGEMENTS | SolveeIt | Solveeit

Today, August 19

Question

The number of diagonals in a octagon is

A

28

B

20

C

10

D

6

Answer

20

Explanation

Solution

n = 8; no. of diagonals = ⁸C₂ – 8 = 20