Answer:
![2l + 2w](https://img.qammunity.org/2022/formulas/mathematics/high-school/q35kry6hhmem5ovhtt41guwf01a8vkzbju.png)
Explanation:
We know that a rectangle has four sides. And each pair of opposite sides are equal. We can set the length to
and the width to
. Since we know that both variables have a side that is equal to it, we know that the sum of the sides is
.