The width is unchanged, the length is increased by 4cm, and the area is increased by 28cm2. Description: Increase the area of a rectangle with the same width and 4cm length as the original rectangle, with an area of 28cm2. That is to say: the area of a rectangle is 28 square centimeters, and the length of one side is 4 centimeters. Find the length of the other toilet. So, 28 ÷ 4 = 7 cm.
A: The original rectangular span is 7 cm.