Question

One side of a regular pentagon is $5\text{cm}$. Its perimeter is:

• A. $10\text{cm}$
• B. $25\text{cm}$
• C. $15\text{cm}$
• D. $50\text{cm}$

Answer 1

The correct option is B

$25\text{cm}$

As pentagon has five sides, so substitute $n=5$ and length of each side $=5$

So, perimeter $=n\times$ length of each side

$\begin{array}{rcl}P& =& 5\times 5\\ & =& 25\text{cm}\end{array}$

Hence, the correct option is (B) .