That will depend on the information given as for example if you are given its width and area then in order to find its length divide the width into the area.
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Area of rectangle with part of the shape missing = area of rectangle (lengthxwidth)-area of missing part.
A rectangle has a length, a width, and an area. If you know any two of them, you can figure out the missing one.
the length of a rectangle is 8 more than the width. the area os 345 centimeters. find the length and width of the rectangle
Area of rectangle divided by its length = width of rectangle
You cannot find the area of a rectangle if you only know its length. You need to know its width too. Then you multiply its length by its width.