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The number of diagonals of a polygon of ...

The number of diagonals of a polygon of n sides is

A

`(n(n-1))/2`

B

`(n(n-3))/2`

C

`((n-1)(n-2))/2`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • The number of diagonals of a polygon of 15 sides is

    A
    105
    B
    90
    C
    75
    D
    60

  • The number of diagonals of a polygon of 15 sides is:

    A
    105
    B
    90
    C
    75
    D
    60

  • The number of diagonals in a polygon of m sides is

    A
    `1/(2!)m(m-5)`
    B
    `1/(2!)m(m-1)`
    C
    `1/(2!)m(m-3)`
    D
    `1/(2!)m(m-2)`

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