Xiao Li wants to cut a rectangular piece of paper with an area of 30 square centimeters on a square piece of paper with an integer length, and make its length and width 2:1. Question: how long is the side length of Xiao Li's square piece of paper at least?

Because the area is 30 square centimeter rectangle, the ratio of length and width is 2:1
So if the width is x, then the length is 2x, X * 2x = 30, then we can calculate x ^ 2 = 15, x = positive and negative root sign 15,
Because it is the side length, the negative value is rounded off, and the width is the root sign 15
Because the root sign 15 is about 3.873, the length is about 7.746
So the side length of a square piece of paper should be at least 8 cm

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