There is no specific answer to this question. Assuming width is the smaller of the two dimensions, then the width, W, can be any number that satisfies
0 < W <= sqrt(20) cm. There are an infinite number of values for W.
The other side of the rectangle will be 20/W cm.
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Multiply the length of the rectangle by the width. For example: 34cm x 20cm = 680cm2
Area of a rectangle = length * width = 72 feet-squared
multiply the width by the length, e.g. 5cm= width, 4cm= length, 5x4= 20, 20cm squared
Width of rectangle: 180/15 = 12 cm
4.5 inches.