Answer
$p=2(l+w)$
Work Step by Step
Step 1. Write the general form as $p=k(l+w)$ where $k$ is a constant.
Step 2. Use the given condition, $k=2$
Step 3. We have $p=2(l+w)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.