Answer:
5 cm
Explanation:
The rectangle has a length (l) of 7 cm and a width (w) of 3 cm. Therefore, the perimeter of the rectangle is:
Perimeter of rectangle = 2(l + w) = 2(7 + 3) = 2(10) = 20 cm
Since the rectangle and the square has the same perimeter, Therefore, the perimeter of the square is:
Perimeter of square = 2(l + w). But the length and width of a square are the same (i.e l = w). Therefore:
Perimeter of square = 4l
20 = 4l
l = 20 / 4 = 5 cm
Each side of the square has a length of 5 cm