Question

The expression for the number of diagonals that we can make from one vertex of a ( 2n - 1 ) sided polygon is_____.

• A. 2n - 5
• B. 2n + 4
• C. 2n - 3
• D. 2n - 4

Answer 1

The correct option is D 2n - 4

Number of diagonals for a polygon of n sides from one vertex = n- 3

Now, Number of diagonals for a polygon of 2n - 1 sides from one vertex = ( 2n - 1 ) - 3
= 2n - 4