First of all, pi is explained as follows:
1, approximate explanation:
3. 14 15926535 8979323846 2643383279 502884 197 1 69399375 10 5820974944 5923078 1 64 0628620899 8628034825 342 16543 8+070679 82 1480865 1 3282306647 0938446095 5058223 172 5359408 128 48 1 1 174502 84 10270 193 852 16 5438+005559 6446229489 5493038 196 44288 10975 665933446 1 2847564823 3786783 165 27 120 1909 1 4564856692 346034866 5438+00 4543266482 1339360726 0249 14 1 273 7245870066 063 15588 17 488 1520920 9628292540 9 17 1536436 7892590360 ......
Second, the concept explanation:
Pi is the ratio of the circumference to the diameter of a circle, which is generally expressed by the Greek letter π and is a universal mathematical constant in mathematics and physics. π is also equal to the ratio of the area of a circle to the square of its radius. Accurate calculation of geometric shapes such as circle perimeter, circle area and sphere volume is the key value. In the analysis, π can be strictly defined as the smallest positive real number x satisfying sin x = 0.
Pi is expressed by the letter π (pronounced pài), which is a constant (approximately equal to 3. 14 1592654), indicating the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal.
Third, the recitation way to explain:
Homophonic method
As we all know, pi is a famous irrational number, an infinite cycle decimal, and irrational numbers are hard to remember. If you use "homophonic method", you can remember the first 100 digits after the decimal point in the following jingle in a few minutes.
Imagine an alcoholic who drank too much in a mountain temple and died drunk in a ravine (30 people):
3. 14 159 26 535897 932 384
A temple on the top of the mountain, a pot of wine. Erle: "I can't eat three pots." Wine can kill you, but it won't kill you.
626 43383 279
Be happy, die, give up drinking.
Then imagine how the father of the "deceased" felt after learning (15):
502 884 197 1 69399
My dear son: "It's sad enough to die in vain and leave it to the ravine."
Imagine again that the father of the "deceased" went to the ravine to find his son three times and five times (15):
375 10 58209 74944
The mountain turns its back on me. I'm afraid I've been frozen for a long time. I'll think about it for a long time.
Imagine finding a "dead" person in a cave and bringing him back to life (40 people):
592 307 8 16 406 286 20899
I saved my son and turned around in the cave. I shouldn't stay. Neighbors are happy, children are unhappy, and children have loved their father for a long time.
86280 348 25 342 1 1 70679
Dad, Le Er didn't understand. "Look before you leap!" Children understand, think twice and loathe to give up, and the wife enjoys it.
The above jingle is a bit fragmentary, but visualizing the abstract number string is very beneficial to memory.
2, couplet back method
Learn a period of literature, have fun, and you will have peace and eternal life.
Only when Philip Burkart thinks small can people speak forcefully.