φ = ( 1 + √5) / 2 ≈ 1.6 180339887 ...
Where the symbol "√" represents the square root, the symbol "/"represents the division operation, and φ represents the golden ratio.
The golden ratio refers to dividing a line segment into two parts, so that the ratio of one part to the total length is equal to the other part, that is, A/B = B/C, where B is the length of the whole line segment. This proportion is regarded as an ideal proportion in aesthetics and widely used in architecture, art, design and other fields.
The golden section formula can be deduced by algebraic method and solving quadratic equation, which is closely related to mathematical concepts such as Fibonacci sequence. Although the golden section formula is not the basic knowledge point of junior high school mathematics, it is very important in senior high school and even college mathematics learning, so junior high school students can also try to understand and master the relevant knowledge of this formula.