Question

Find the perimeter of $▱\mathrm{RISK}$, if$\mathrm{RI}=17$ and $\mathrm{IS}=13$.

Short answer

The perimeter of a parallelogram is 60.

Step-by-step solution

Step 1. Consider a diagram below.

Step 2. Perimeter of a parallelogram.

The perimeter of a parallelogram with sides a and b is given by, $P=2\left(a+b\right)$.

Step 3. Apply a definition of perimeter of parallelogram.

Consider $▱RISK$such that $RI=17$and $IS=13$. Therefore, the perimeter of a parallelogram is

$\begin{array}{c}P=2\left(RI+IS\right)\\ =2\left(17+13\right)\\ =2\times 30\\ =60\end{array}$

Therefore, the perimeter of a parallelogram is 60.