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Hva er Pi?
PI er et veldig interessant tall som er av stor betydning for en matematisk prosess. Imange beregninger av matematikk, for eksempel; Vi kommer over antall pi, for eksempel sirkler, fjærer, pendel...
Vanligvis er enkleste antall pi mye brukt, men det ikke betyr mye. Dette tallet er faktisk forhold og hentes fra diameteren på sirkelens omkrets. Dette kalles 3.14. Du kanmåle det selv, som finner sirkulær objekter hjemme, men sørg for at det er så stor som mulig. La oss bare si du har en glass, hvis du måle omkretsen av glasset først ogderetter dele diameter, du alltid få resultatet av 3.14. Selvfølgelig er det nødvendigå gjøre virkelig nøyaktig måling for at resultatet er nær.
Bevis på pi tilsvarer en 4-tommers avstand når en sirkel med 1.27-tommers diameter åpnes lineært. 4 inches (perimeter) / 1.27 (diameter) = 3.14 som avtalt.
Som sett, hvor PI er egentlig en veldig enkel basis og er en konstant hastighet som ikke kan endres. Men siden Pi er også en irrasjonelle tall, det kan aldri uttrykkes i enbegrenset heltall ordningen og inneholder et uendelig antall gjentatte tall etter komma. Siden babylonerne, er de kjent for å være klar over eksistensen av Pi i Midtøsten og Middelhavet sivilisasjoner. Forskjellige antikke sivilisasjoner har brukt ulike tall for hvor pi. For eksempel på grunn av 2000 F.Kr., babylonerne brukte π = 3 1/8 og gamle egypterne var π = 256/81, dvs. om 3,1605. Likevel er det ikke forstått at πis enirrasjonelle tall for en meget lang tid. I 1761 bevis publisert av Johann Heinrich Lambert viste seg for å være et irrasjonelle antall konstanter. I daglig bruk er det et uendelig antall sifre som ikke gjentas med jevne mellomrom for å uttrykke den sanne verdien, selv om det bare er uttrykt som 3.1416. Desimaltegnet står opp til de første65 sifrene er som følger:
3, 14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 749445923
Flere konkurranser avholdes i dag til å beregne maksimalt antall pi etter kommaet. Posten er nå kjent som 73 milliarder sifre etter kommaet.
Historie
Antall Pi var kjent av Babylon, de gamle egypterne og mange gamle sivilisasjoner. De innså at omkretsen av alle sirkler var lik et fast antall deler. Tilstedeværelsen av denne faste tall nå kan beregning av omkretsen av hver kjente sirkel. Rundt 2000 F.Kr.,brukte babylonerne p nummer 31/8 eller 3.125. I antikkens Hellas, ble kvadratrotenbrukt i 10-eller 3.162. Arkimedes (f.Kr. 287-212) brukt 3 10/71 og 3 1/7 som P.
I 500 e.Kr. brukte han 3.1415929 for P nummer. I 1424, var seksten sifrene etter kommaet riktig kjent i Iran. I 1596, tysk Ludolph van Ceulen beregnet på tjue sifre etter Pkomma, og dette tallet var kjent som Ludolph konstant i Europa. Etter denne datoen, ble antall P beregnet av milliarder av sifre etter kommaet.
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