More than 2000 years ago, Euclid showed in his book Elements how to calculate the golden ratio. It is claimed that this specific ratio occurs in the natural world, such as the structures of some plants and the growth of animal populations. If the ratio of a rectangle's length to its width equals the golden ratio, it is called a golden rectangle. These rectangles were used in many works of art and architecture to produce rectangles of pleasing proportions. Look on the Internet or through books to find out: What is the golden ratio? What is an example of how the golden rectangle might have been

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