Perhaps you mean the golden ratio or golden section.
If you divide a segment in two so that the ratio of the small part to the large part is the same as the ratio of the large part to the whole segment, then the ratio of the two parts is known as the golden ratio. This was known to the ancient Greeks, and was said to produce pleasing images and architecture.
The exact value can be found from (1 + sqrt(5))/2 = (1 + 2.2360679775...)/2 or approximately 3.236/2 = 1.618. This number is usually represented by the Greek letter phi, which looks like an "o" with a vertical line through it.
The ratio can be expressed as 1.618 : 1 or 1 : 0.618 or 0.618 : 0.382.
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Our appreciation of the golden ratio probably derives from some kind of subconscious mathematical process. Our brains do all sorts of things that we do not consciously know about. In an evolutionary sense, we are designed to recognize patterns, since that is central to our understanding of the world in which we live and our ability to function within it, and as a result, we often see patterns, even when they are illusionary. The golden ratio is a pattern of sorts.
No, there's no golden pentagon.
There are both golden triangles and golden rectangles. In order to be considered golden the ratio must be the same as the sum of the longest side to the other two sides.
when golden rectangle constructed?
conclusion