A rectangle is a four-sided figure with two long sides and two short sides. The two long sides are the length of the rectangle. The two short sides are the width of the rectangle.
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width=9 length=18
Length = 4, Width = 2
length times width
area of a rectangle = length * width. Rearranging, we have width = area / length. Therefore, the width of the rectangle = 31.2 [m2] / 6 [m] = 5.2 [m] ========================
The perimeter of a rectangle is the distance around the rectangle. The area of a rectangle is the space inside the rectangle. To calculate either one you need the length and the width of the rectangle. To calculate the area multiply the length times the width. To calculate the perimeter add the length+width+length+width (that is the distance all the way around)