Let's start with Wu. In a triangle, Wu is a special angle whose size is 180 degrees minus the right angle (90 degrees). In other words, a right angle equals a right angle. However, it is widely used in mathematics. It appears in many mathematical formulas, such as trigonometric function, exponential function, logarithmic function and so on. The introduction of pentagonal angle makes these mathematical formulas more concise and beautiful. At the same time, Wu also plays an important role in the fields of physics and engineering.

So, what is the connection between Wu and π? The answer lies in the ratio of the circumference to the diameter of a circle. As we know, the circumference of a circle is the distance (radius) from the center of the circle to any point on the circle multiplied by 2π. The diameter divides the circle into two symmetrical semicircles through the two points of the center of the circle. Therefore, the ratio of the circumference to the diameter of a circle is 2π. This ratio is of great significance in mathematics, physics and other fields. π is an irrational number, which has a long history of research in the history of mathematics.

The ancient Greek mathematician Archimedes once said, "Mathematicians will pursue the exact value of π until the end of the universe." The mystery of π lies in that it is an infinite acyclic decimal, but we can approximate its value by infinite series and integral. The value of π is 3.14159265358979323846 ..., and the numbers after it are infinitely extended and never repeated. It is this mystery that makes π the focus of mathematicians' research.

Interestingly, Wu also has a wonderful relationship with π in nature. For example, the spiral of snails is related to Wu and π. The spiral of a snail is a typical archimedean spiral, and its shape can be described by an upright angle. The pattern on the snail shell can be explained by π. Because the growth process of snails is carried out according to a certain proportion, and this proportion happens to be related to π. Therefore, we can say that Wu and π are also widely used in nature.