Final answer:
To find the perimeter of a rectangle, use the formula P = 2l + 2w, but double-check that the diagonal is longer than both sides. Given the example in the question, the calculation is incorrect because a diagonal cannot be shorter than any side of a rectangle.
Step-by-step explanation:
The student asked how to find the perimeter of a rectangle given the side length of 6 cm and a diagonal length of 5 cm. Unfortunately, the given dimensions are likely a mistake since the diagonal cannot be shorter than either side in a rectangle. However, to find the perimeter of a rectangle, you would normally use the formula P = 2l + 2w, where l is the length and w is the width of the rectangle.
In the case of the provided example from a town square, the perimeter can be calculated by doubling the length (39.2 meters) and width (17.5 meters) and adding these together, resulting in a perimeter of (2 × 39.2 m) + (2 × 17.5 m) = 113.4 meters.