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Số Pi là gì?

Pi là một số rất thú vị đó là rất quan trọng cho bất kỳ quá trình toán học. Trong các tính toán nhiều của toán học, ví dụ; Chúng tôi đi qua một số pi, chẳng hạn như vòng tròn, lò xo, con lắc...

 

Nói chung, số pi, đơn giản nhất sử dụng rộng rãi, mặc dù nó không có nghĩa là nhiều. Con số này là thực sự là một tỷ lệ và thu được từ các đường kính của vòng tròn vành đai. Tỷ lệ này được gọi là 3.14. Bạn có thể đo lường nó cho mình, như tìm thấybất kỳ đối tượng tròn ở nhà, nhưng chắc chắn nó là lớn nhất có thể. Hãy chỉ nói rằng bạn có một kính, nếu bạn đo chu vi của kính đầu tiên và sau đó chia cho đường kính, bạn luôn luôn có được kết quả của 3.14. Tất nhiên, nó là cần thiết để thực hiệnmột phép đo chính xác thực sự cho một thực tế rằng kết quả là gần gũi.

 

Bằng chứng của pi tương ứng với khoảng cách 4 inch khi một vòng tròn với đường kính 1.27-inch được mở tuyến tính. 4 inch (chu vi) / 1.27 (đường kính) = 3,14 theo thoả thuận.

 

Như đã thấy, số PI là về cơ bản là một cơ sở rất đơn giản và tốc độ liên tục mà không thể thay đổi. Nhưng kể từ khi Pi cũng là một số vô tỉ, nó không bao giờ có thể được bày tỏ trong một sơ đồ hữu hạn số nguyên và có chứa một số lượng vô hạn củalặp đi lặp lại con số sau dấu phẩy. Kể từ Babylon, họ biết được nhận thức về sự tồn tại của Pi tại Trung Đông và nền văn minh địa Trung Hải. Nền văn minh cổ đại khác nhau đã sử dụng số khác nhau cho số pi. Ví dụ, do 2000 trước công nguyên, Babylon đã sử dụng số π = 3 1/8 và cổ đại Ai Cập đã π = 256/81, tức là về 3,1605. Tuy nhiên, nó không phải là hiểu rằng πis một số vô tỉ một thời gian rất dài. Năm 1761, chứng cứ được công bố bởi Johann Heinrich Lambert đã chứng tỏ là một số vô tỉ của hằng số. Trong sử dụng hàng ngày, đó là một số lượng vô tận của chữ số không lặp lại theo định kỳ để thể hiện giá trị đích thực, mặc dù nó chỉ đơn giản là được thể hiện như nó xỉ 3.1416. Số thập phân là viết tắt của tối đa các chữ số đầu tiên 65 là nhưsau:

 

3, 26535 14159 23846 89793 26433 83279 50288 41971 69399 37510 58209 5923 người 74944


 

Hôm nay, một số cuộc thi được tổ chức để tính số pi, tối đa sau dấu phẩy. Hồ sơ bây giờ được biết đến là 73 tỷ chữ số sau dấu phẩy.

 

Lịch sử

Số Pi đã được biết đến bởi Babylon, người Ai Cập cổ đại và nhiều nền văn minh cổ đại. Họ nhận ra rằng chu vi của tất cả các vòng tròn là tương đương với số lượng các bộ phận cố định. Sự hiện diện này cố định số bây giờ cho phép tính chu vi của mỗi vòng tròn được biết đến. Khoảng 2000 năm TCN, Babylon đã sử dụng số p 31/8 hoặc 3.125. Hy Lạp cổ đại, bậc được sử dụng trong 10 hoặc 3.162 số. Archimedes (287 – 212 trước công nguyên) sử dụng số 3 10/71 và 3 1/7 số P.

 

Trong 500 AD, ông đã sử dụng 3.1415929 cho P số. 1424, mười sáu chữ số sau dấu phẩy được một cách chính xác gọi ở Iran. Năm 1596, Đức Ludolph van Ceulen tính hai mươi chữ số sau dấu phẩy của P và con số này được gọi là hằng số Ludolph ở châu Âu. Sau ngày đó, số lượng P được tính bằng tỷ số sau dấu phẩy.

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