Question

Find the side of the square whose perimeter is $20\text{m}$.

Answer 1

Step 1: Let the side of the square be $s$. The perimeter, $P$ of the square is, $P=4s$. Substitute $P=20$ into the formula of perimeter and solve for $s$.

$\begin{array}{rcl}P& =& 4s\\ 20& =& 4s\end{array}$

Step 2: Divide both sides of the equation by $4$ and solve for $s$.

$\begin{array}{rcl}\frac{20}{4}& =& \frac{4s}{4}\\ 5\text{m}& =& s\end{array}$

Hence, the side of the square is, $5\text{m}$.