π is also equal to the ratio of the square of the area and radius of a circle, which is the key value to accurately calculate the geometric shapes such as the circumference of a circle, the area of a circle and the volume of a ball. In the analysis, π can be strictly defined as the smallest positive real number x satisfying sinx=0.
Pi is expressed by the Greek letter π (pronounced pài), which is a constant (approximately equal to 3. 14 1592653), representing the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal.
In daily life, pi is usually expressed as 3. 14, which is used for approximate calculation. The fractional part 3. 14 1592653 is enough for general calculation. Even if engineers or physicists want to make more accurate calculations, they only need to take the values to a few hundred decimal places at best.
Back method:
If we want to recite pi, then we just need to master some vivid memory skills. It is generally impossible to learn by rote.
If you start training at an early age, then reciting is actually very simple. Basically, a kindergarten child can simply remember the pi of more than 5000 people.
Of course, this memory takes time. Generally speaking, people who remember this kind of memory choose to recite hundreds of numbers in their hearts every day, and then accumulate them over time.
So when we remember, we need to know the skills. If we master the image memory skills, then after remembering 200 digits, then remembering hundreds of digits every day will be permanent and profound in our own minds.
When we are memorizing, we can choose a memorized table and replace the numbers from 0 1 to 9900 100 with graphics.