There's not enough information to answer this question. The height needs to be known as well.
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700cm
The width is 10.5 cm.
Do-it-in-your-head method: Length plus width is half the perimeter ie 161 cm, of which 68 is width so the length is 93 cm.
To find all the rectangles with a perimeter of 26 cm, we can use the formula for the perimeter of a rectangle: P = 2(l + w), where P is the perimeter, l is the length, and w is the width. Since the perimeter is given as 26 cm, we have 26 = 2(l + w). We can then list all the possible combinations of length and width that satisfy this equation, such as (length 10 cm, width 3 cm), (length 8 cm, width 5 cm), and so on.
60 and 62