Answer
Because the area has to stretch out over a longer distance as the diameter grows, the walkway's width narrows.
Work Step by Step
Because the area has to stretch out over a longer distance as the diameter grows, the walkway's width narrows.
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.