Final answer:
The perimeter P of a square is equal to four times the length of one of its sides t, which gives us the formula P = 4t. The correct answer is option b).
Step-by-step explanation:
The relationship between the perimeter P of a square and the length of one of its sides t is that the perimeter is equal to four times the side length. Therefore, the correct formula expressing this relationship is P = 4t. For example, if a side of the square is 3 meters long.
The perimeter would be 4 times this length, which gives us 12 meters. This is consistent with the definition that the perimeter of a square is the total distance around the square, which is equal to the sum of all four sides. Since all sides of a square are equal, one side length multiplied by four will give us the total perimeter.