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生活在大城市的人們基本上都碰到過停車難的情況，下面通過公式帶給我們的啟發(fā)知道只要滿足公式的條件要求，我們都可以停車，不會(huì)再因?yàn)橥＼嚳臻g而煩惱！

If you live in a big city, this scenario is all too familiar: Traffic is bad. You're late for work. And, of course, the parking garage is now full. So you're forced to parallel park on the street. You finally find a spot between two hulking SUVs, but it looks pretty tight. Do you go for it or move on?

生活在大城市的你都遇到過這樣的情況吧：塞車！遲到！停車位已滿！因此你不得不決定把愛車停在大街上。好不容易找到2輛SUV的些許間隙，可是它看起來是如此緊密。停？還是不停？這是個(gè)問題。

Not to worry; geometry can save you. Run a simple calculation and - voila! - you'll know just what to do.

不用擔(dān)心，幾何學(xué)來幫你。只要一個(gè)公式，一切煩惱沖云霄。

Ignore the car that's sneaking into your space as you do the calculation. You'll need a few pieces of information:

先不用管身旁大吼的寶貝車，開始數(shù)學(xué)課吧。

Your car's turning radius, r
The distance between the front and rear wheels, l
The distance from your front wheel to the corner of the front bumper, k
The width of the car you're trying to park behind, w

需要的信息：你車的轉(zhuǎn)向半徑r，前輪和后輪的距離，輪到前保險(xiǎn)杠的距離k，你車停在后面的寬度w。


Now it's simply a matter of plugging those variables into the handy formula (see our illustration), and you'll know if that spot could have been yours.

現(xiàn)在就是把這些變量塞到公式里啦，然后就馬上可以回答那個(gè)生命有關(guān)的問題。

The formula for the perfect parking job was recently worked out by mathematician Simon Blackburn, professor at the University of London. Stanford mathematics professor Keith Devlin tells NPR's Audie Cornish "it's actually a very clever use of simple mathematics."

這個(gè)完美停車公式是最近由倫敦大學(xué)的數(shù)學(xué)家Simon Blackburn教授提出的。史丹佛大學(xué)數(shù)學(xué)教授Keith Devlin告訴NPR記者Audie Cornish：“這其實(shí)是一個(gè)從最簡單的數(shù)學(xué)提煉出的非常高明的方式?！?

The most complicated part, Devlin says, is our good old friend the Pythagorean theorem. That's a squared plus b squared equals c squared, as you'll remember from your high school geometry class, no doubt.

Devlin說，最復(fù)雜的部分便是我們熟知的畢達(dá)哥拉斯定理。這個(gè)理論在高中幾何學(xué)課堂上就學(xué)過啦。


"The formula tells you exactly how much extra space you need, beyond the length of your vehicle, in order to park it in a simple, reverse-in, straighten-the-wheels, switch-the-engine-off move," Devlin explains. In other words, no back-and-forth, no see-sawing - the perfect parallel parking job.

Devlin解釋說：“這個(gè)公式精確的告訴你需要停車的適當(dāng)距離，無論你的車長多少，只要扭轉(zhuǎn)、直輪、剎車，沒有前后搖動(dòng)、沒有左右擺不停，讓你完美停車，完美動(dòng)作?！?/font>

Blackburn's formula does this by sketching the arc of your car's turning capability into a full circle, then using the center of the circle to create the right-angle triangles Pythagoras loved.

Blackburn教授的公式通過對(duì)車的弧度和轉(zhuǎn)角能力畫圈，利用圓心來設(shè)置一個(gè)直角三角形。

That's a lot of work just to tell you if you have enough space for an easy park. And it doesn't tell you how to do the parking. That's something you have to learn by doing, which is how most people figure out whether they have enough space to park in the first place. Devlin says that behind all that guessing, math is at work.

這樣就足以告訴你是否有足夠的空間順利停車。不過這并沒有告訴你怎樣停車。你必須通過實(shí)踐來熟悉和清楚，那就是為什么有的人第一眼就知道這個(gè)停車位是否有足夠的空間。

"Mathematics gives you a way of understanding in detail what people have learned to do simply by practice and expertise," he says.

他說：“人們只是簡單地通過操作來知道怎么做，而數(shù)學(xué)就幫我們理解為什么這么做可以做到的原因?！?/font>

"In fact, when we practice something, be it on the athletic field or in an automobile, we are becoming very good mathematicians at doing a particular kind of operation," Devlin says. "But usually we don't call it mathematics - and we certainly don't give people a pass on the math test because they can park their car."

Devlin教授說：“實(shí)際上，無論是在體育還是機(jī)動(dòng)領(lǐng)域，人們在解決某些事情的時(shí)候已經(jīng)成為數(shù)學(xué)家。不過一般我們不把它和數(shù)學(xué)練習(xí)起來——我們不會(huì)因?yàn)槟阒涝趺赐＼嚩o你的數(shù)學(xué)考試打及格?！?/font>

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