内容简介：If you think about it, pi is really weird. This irrational number shows up in the craziest places. If you swing a mass back and forth on string,Of course, most people associate pi with circles. That's understandable, since the most basic definition of pi i
If you think about it, pi is really weird. This irrational number shows up in the craziest places. If you swing a mass back and forth on string, there's a pi in there . It pops up in the Heisenberg uncertainty principle , Einstein's general relativity, and the interaction between two electric charges.
Of course, most people associate pi with circles. That's understandable, since the most basic definition of pi is the ratio of the circumference to the diameter of a circle:
Now for the important part. Tomorrow, as you may know, is Pi Day. Why tomorrow? Because it’s March 14—yes, 3/14—and 3.14 is the value of pi to two decimals. Of course, the actual number continues to an infinite number of decimal places: 3.14159265359 … and so on forever. That’s why it’s called irrational.
I should add that the US is pretty much the only place that uses the middle-endian date format of month/day/year. If you go with the little-endian format of day/month/year, then today is 14/3—which is obviously not pi. (In that case I suggest July 22, since the fraction 7/22 is a fairly decent approximation for pi.)
Anyway, my traditional way of celebrating Pi Day is to find a new way each year of calculating a numerical value for pi. It's just what I do. I've been at this for quite some time now, so here are some of my favorites:
- Finding piusing random numbers (and Python)
- Determining the value of pi using a mass oscillating on a spring
- Actually measuring the circumference and diameter of real circles
I have even more Pi Day posts here . But now let's try this a new way. Let’s see how close we can get to pi by drawing a circle.
Here's how this will work. You draw a circle. From that circle, you can determine both the circumference and the radius. Then the value of pi would be the circumference divided by twice the radius. Simple, right?
Oh, but what if your circle isn't perfect? I mean, who draws perfect circles anyway? Let's imagine that this un-perfect circle is actually a bunch of discrete points connected by line segments. If you zoomed on a part of it, it might look like this:
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他们以为自己很厉害：12个企业管理陷阱
[法] 克里斯蒂娜•凯德朗 / 王倩 / 人民邮电出版社 / 2018-11 / 69.00元
本书讲述了震惊世界的150个企业管理失败案例，并从产品与服务定位、技术 创新、广告与营销策略、跨文化发展、融资战略到企业文化与员工管理等众多角度， 揭露了商场各种败局的内幕。作者以风趣的笔触讲述了国际知名企业和商界精英们 的惨痛教训，又以专业角度解读了这些失利背后的经济学和管理学因素，给读者带 来了启示。一起来看看 《他们以为自己很厉害：12个企业管理陷阱》 这本书的介绍吧!
