Final answer:
To find the amount of skirting to buy, calculate the perimeter of the table by using the formula P = 4s, where s is the length of a side.
Step-by-step explanation:
To find the amount of skirting Mrs Ali needs to buy, we need to calculate the perimeter of the table, as skirting is required to go around all four sides. Since the table is a square, all sides are equal in length. The formula for the perimeter of a square is P = 4s, where P is the perimeter and s is the length of a side. In this case, the length of the table is 3 meters, so the perimeter would be 4 × 3 = 12 meters. Therefore, Mrs Ali needs to buy 12 meters of skirting.
Learn more about Calculating perimeter of a square