Question

How many diagonals are three in pentagon?

• A. $5$
• B. $7$
• C. $6$
• D. $10$

Answer 1

The correct option is A $5$

We know that to calculate number of diagonals we use the formula $=n\times (n-3)/2$ where $n$ is the number of sides.

But here $n=5$ as it is a pentagon

So,

$5\times (5-3)/2=5$

Hence, $5$ diagonals are there in a pentagon