π的故事

圆周率简介

圆周率π(Ratio of circumference to diameter;Pi)是圆的周长与直径的比值,一般用希腊字母π表示,是一个在数学及物理学中普遍存在的数学常数。π也等于圆形之面积与半径平方之比。是精确计算圆周长、圆面积、球体积等几何形状的关键值。在分析学里,π可以严格地定义为满足 sin(x)=0 的最小正实数x。

圆周率用字母π(读作pài)表示,是一个常数(约等于 3.141592654),是代表圆周长和直径的比值。它是一个无理数,即无限不循环小数。在日常生活中,通常都用3.14代表圆周率去进行近似计算。而用十位小数 3.141592654 便足以应付一般计算。即使是工程师或物理学家要进行较精密的计算,充其量也只需取值至小数点后几百个位。

圆周率100位

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679

 圆周率的记忆方法

世界纪录是100,000位,日本人原口证于2006年10月3日背诵圆周率π至小数点后100,000位。

普通话用谐音记忆圆周率的有“山巅一寺一壶酒,尔乐苦煞吾,把酒吃,酒杀尔,杀不死,乐而乐”,就是3.1415926535897932384626。另一谐音为:“山巅一石一壶酒,二妞舞扇舞,把酒沏酒扇又扇,饱死啰”,就是3.14159265358979323846。

英文中,会使用英文字母的长度作为数字来记忆圆周率,例如“How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics. All of the geometry, Herr Planck, is fairly hard, and if the lectures were boring or tiring, then any odd thinking was on quartic equations again.”,就是 3.1415926535897932384626433832795。

 圆周率1000位

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989

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