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Vad är Pi?
PI är ett mycket intressant tal som är av stor betydelse att någon matematisk process. I många beräkningar av matematik, till exempel; Vi stöter på numrera av pi, såsomringar, fjädrar, pendel...
Allmänhet, enklaste numrera av pi används flitigt, men det inte betyder mycket. Detta nummer är faktiskt ett förhållande och erhålls från cirkelns omkrets diameter. Denna kurs är känd som 3,14. Du kan mäta det själv, liksom hitta någon runda objekt hemma, men se till att det är så stor som möjligt. Låt oss bara säga du har ett glas, om du mäta omkretsen på glaset först och sedan dividera diametern, du alltid få resultatet av 3,14. Det är naturligtvis nödvändigt att göra en riktigt exakt mätning för attresultatet är nära.
Motståndskraftigt av pi motsvarar en 4-tums avstånd när en cirkel med en 1,27-tums diameter öppnas linjärt. 4 inches (omkretsen) / 1,27 (diameter) = 3.14 enligt överenskommelse.
Som sett antalet PI är i huvudsak en mycket enkel grund och är en konstant som inte kan ändras. Men eftersom Pi är också ett irrationellt tal, det kan aldrig uttryckas i ett system med ändliga heltal och innehåller ett oändligt antal upprepade nummer efter ett kommatecken. Sedan babylonierna, är de kända att vara medveten om förekomsten av Pi i Mellanöstern och Medelhavsområdet civilisationer. Olika forntida civilisationer har använt olika siffror för antalet pi. Till exempel på grund av 2000 f.Kr., babylonierna använde π = 3 1/8 och gamla egyptierna var π = 256/81, dvs om 3,1605. Det är dock inte förstått att πis ett irrationellt tal under mycket lång tid. 1761 visade de bevis som publiceras av Johann Heinrich Lambert sig vara ett irrationellt tal avkonstanter. I dagligt bruk finns det ett oändligt antal siffror som inte upprepas med jämna mellanrum för att uttrycka det sanna värdet, även om det är enkelt uttryckt som 3.1416. Decimalen står upp till de första 65 siffrorna är följande:
3, 14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 749445923
Idag, hålls flera tävlingar för att beräkna det maximala antalet pi efter kommatecknet. Posten är nu känt att 73 miljarder siffror efter kommatecknet.
Historia
Numrera av Pi var känd av Babylonien, egyptierna och många forntida civilisationer.De insåg att omkretsen av alla cirklar var lika med ett fast antal dess delar. Närvaronav denna fasta nummer nu kan beräkningen av omkretsen av varje känd cirkel. Omkring 2000 f.Kr., använde babylonierna p-nummer 31/8 eller 3.125. I antikens Grekland användes kvadratroten i 10 eller 3.162 nummer. Arkimedes (287 – 212 F.kr) används antalet 3 10/71 och 3 1/7 som P-nummer.
I 500 e.Kr. använde han 3.1415929 för P-nummer. I 1424, var de sexton siffrorna efter kommatecknet korrekt kända i Iran. 1596, tyska Ludolph van Ceulen beräknas de tjugo siffrorna efter Perssons kommatecken, och detta nummer var känd som Ludolph konstanten i Europa. Efter detta datum beräknades antalet Perssons av miljarderna siffror efter kommatecknet.
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