Traditional Culture Encyclopedia - Photography major - The student union will hold a campus photography art exhibition, and Obana Xiaogang is going to set a circle of paper edges with the same width around the rectangular works, as shown in the figure.

The student union will hold a campus photography art exhibition, and Obana Xiaogang is going to set a circle of paper edges with the same width around the rectangular works, as shown in the figure.

Solution: Only a square can do it. Let one side of the rectangle be A and the other side be B, and the width of the paper with the same width is C. According to Xiaohua's requirements, it should be =, which is simplified as A = B.