A rectangle whose side lengths are in the golden ratio is called a golden rectangle.
Golden rectangles have the property of leaving a smaller golden rectangle when a square with side lengths equal to the width of the original rectangle is cut from them.
The resulting rectangle CFEB is similar to the original rectangle ACFD, as both are golden rectangles.
ACFD∼CFEB
Extra
Golden Rectangle in Nature
Ammonites are a group of extinct shellfish whose shell had a spiral shape. A peculiarity of the shell of an ammonite is that its length and width are in golden ratio. That means the shell fits into a golden rectangle.
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