Question

What is the perimeter of a regular pentagon with a side whose length is $x+4$?

Answer 1

Determine the perimeter of the pentagon.

The pentagon is a regular pentagon with the length of a side equal to $x+4$.

Use the formula $P=5a$ to find the perimeter of the regular pentagon:

$\begin{array}{rcl}P& =& 5\left(x+4\right)\\ & \Rightarrow & P=5x+20\end{array}$

Hence, the perimeter is $5x+20$.