Answer: 288 inches
Explanation:
Given : Rosa is sewing a ribbon around the sides of a square blanket.
Each side of the blanket is 72 inches long.
Then, the length of the required ribbon = Perimeter of the square blanket. (1)
Perimeter of square =4 (Side)
Then, Perimeter of the square blanket= 4(72)=288 inches (2)
From (1) and (2),
The length of the required ribbon = 288 inches