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Hvad er Pi tal?
Pi er en meget interessant tal, der er af stor betydning for enhver matematisk proces. I mange beregninger af matematik, for eksempel; Vi kommer på tværs af antalletaf pi, såsom cirkler, fjedre, pendul...
Generelt, den enkleste antallet af pi er udbredt, selv om det ikke betyder meget. Dette nummer er faktisk en ratio og er fremstillet af diameteren af den cirkel perimeter.Denne sats er kendt som 3,14. Du kan måle det selv, gerne finde nogen cirkulære objekter i hjemmet, men sørg for det er så stort som muligt. Lad os bare sige du haren glas, hvis du måle omkredsen af glasset først og derefter dividere diameter, du altid få resultatet af 3.14. Det er naturligvis nødvendigt at gøre en virkelig præcis måling for, at resultatet er tæt.
Bevis for pi svarer til en 4 tommers afstand når en cirkel med en diameter på 1,27-tommer åbnes lineært. 4 inches (omkreds) / 1,27 (diameter) = 3,14 som aftalt.
Som det ses, PI antallet er hovedsageligt en meget enkel basis og er en konstant hastighed, der ikke kan ændres. Men da Pi er også en irrationelle tal, det kan aldrig være udtrykt i en finit heltal ordning og indeholder et uendeligt antal gentagne numreefter et komma. Siden babylonerne, er de kendt for at være klar over eksistensen afPi i Mellemøsten og Middelhavsområdet civilisationer. Forskellige gamle civilisationer har brugt forskellige numre til pi antallet. For eksempel på grund af 2000 f.kr., babylonierne var benytter π = 3 1/8 og gamle egyptere var π = 256/81, dvs om3,1605. Det er imidlertid ikke forstået at πis en irrationelle tal i meget lang tid. I 1761, beviser offentliggjort af Johann Heinrich Lambert viste sig for at være en irrationelle tal af konstanter. I daglig brug er der en endeløs række af cifre, der ikke gentages med jævne mellemrum for at give udtryk for den sande værdi, selv om det er simpelthen udtrykt som 3,1416. Decimaltegnet står op til de første 65 cifre er som følger:
3, 14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 749445923
Flere konkurrencer afholdes i dag, til at beregne det maksimale antal pi efter kommaet. Posten er nu kendt for at være 73 mia cifre efter kommaet.
Historie
Antallet af Pi var kendt af Babylon, de gamle egyptere og mange gamle civilisationer. De indså, at omkredsen af alle kredse var lig med et fast antal dens dele. Tilstedeværelsen af dette faste nummer nu giver mulighed for beregning af omkredsen af hver kendt cirkel. Omkring 2000 f.kr., var babylonierne benytter Pedersen nummer 31/8 eller 3.125. I det antikke Grækenland, blev kvadratroden brugt i 10 eller 3.162 numre. Arkimedes (287-212 fra f.kr.) bruges antallet af 3 10/71 og 3 1/7 som P-nummer.
I 500 e.kr. brugte han 3.1415929 til P nummer. I 1424, blev de seksten cifre efter kommaet korrekt kendt i Iran. I 1596, tysk Ludolph van Ceulen beregnes de tyve cifre efter Pedersens komma, og dette tal var kendt som Ludolph konstant i Europa. Efterdenne dato, blev antallet af Pedersens beregnet af milliarder af cifre efter kommaet.
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