Recognize Problem Type: Recognize the problem type: We need to find a missing side length, but the problem lacks context. Assuming it's a square with all sides equal.
Calculate Side Length: Calculate the side length: Since all sides of a square are equal, the missing side length is the same as the given side length, which is 3.
Verify Calculation: Verify the calculation: Check if the side length calculation makes sense for a square. Yes, all sides are equal, so the missing side length is indeed 3.