Pi has mesmerized mathematicians for 4,000 years. It's the rarest of mathematical constants, an unfailingly accurate ratio that's also neverending. The digits of Pi have been calculated out to超过22万亿位的小数没有重复(那个被称为“无理数“)。
The definition of pi is simple: It's the ratio of a circle's circumference divided by its diameter. But what's remarkable is that no matter the size of the circle you are measuring, that ratio of circumference to diameter will always equal 3.1415926535897, usually shortened to 3.14. Divide the circumference of a tennis ball by its diameter and you get 3.14. Divide the circumference of the planet Mars by its diameter and you get 3.14. Divide the circumference of the known universe by its diameter — you get the point.As one mathematician put it,“PI是圆圈性质的一部分。如果比例不同,那不是一个圆圈。”
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The following figure shows how the circumference of a circle with a diameter of 1.27 inches (32.35 millimeters) is equal to a linear distance of 4 inches (10.16 centimeters):
如您所要想,4.0(周长)/ 1.27(直径)= 3.14。
PI对几何,物理和工程中的几种基本计算至关重要,包括圆形(πr2)和圆筒的体积(πr2)h。当古老的巴比伦试图在1900 B.C.E中测量圈子的精确区域时,它们为3.125的PI分配了一个值。古埃及人提出3.1605。希腊数学家Archimedes(287-212 B.C.E.)和中国数学家Zu Chongzhi(429-501 C.E.)共同归功于计算most accurate approximations of pibefore calculus and supercomputers gave us the definitive answer [source:探索者]。
1706年,自学威尔士数学家威廉琼斯分配了希腊字母Π对于这个魔法号码而没有结束,可能是因为π是周边和周边的希腊词的第一个字母。符号的使用稍后推广到18世纪的瑞士数学家莱昂哈德·欧拉·欧拉,但直到1934年直到全球未被采用。
PI可以在任何地方找到PI - 不仅在圈子中,而且在弧形,摆锤和interplanetary navigation- 而且它无限漫长的启发了一个邪教,其中包括大量令人讨厌的纹身甚至是自己的国民假期。继续阅读以了解你的方式,也可以庆祝国家pi日。
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