How many diagonals can be drawn by joining the angular points of an octagon?

2013

Answer: B. 20 — The number of diagonals in an n-sided polygon is calculated using the formula n(n-3)/2. For an octagon, n = 8. Substituting this value: 8(8-3)/2 = 8(5)/2 =…

A.
14
B.
20
C.
21
D.
28

Attempted by 117 students.

Show answer & explanation

Correct answer: B

The number of diagonals in an n-sided polygon is calculated using the formula n(n-3)/2. For an octagon, n = 8. Substituting this value: 8(8-3)/2 = 8(5)/2 = 40/2 = 20. Therefore, there are 20 diagonals.

Explore the full course: Iocl Engineers Officer Grade A Paper 1