Final answer:
The perimeter of a square whose side is 5 inches is calculated using the formula P=4s. By substituting the length of the side, the perimeter is found to be 20 inches.
Step-by-step explanation:
The relationship between the perimeter P of a square and the length of its side s is given by the formula P=4s. To find the perimeter of a square with each side measuring 5 inches, you simply substitute the value of s into the formula:
P = 4 × s
P = 4 × 5 inches
P = 20 inches
Therefore, the perimeter of the square is 20 inches.