Question

How many diagonals are there in a polygon having $12$ sides?

• A. $12$
• B. $24$
• C. $36$
• D. $54$

Answer 1

The correct option is D $54$

We know that to calculate number of diagonals in a polygon we use the fromula $n\times (n-3)/2$

But here $n=12$ (Given)

So,

$12\times (12-3)/2=54$

Hence, there are $54$ diagonals in a polygon having $12$ sides