Learn about angle axioms, how to calculate perimeters and areas, 3D geometry and much more.

学习角公理、如何计算和面积、三维几何等等。

Here are some of the key features of the campus: the circular four-story building will be around a mile in circumference in the third of a mile wide.

环形建筑为1英里左右，宽度则为1/3英里。

Using this, he actually measured the circumference of the Earth, and he got it right 2,000 years ago.

利用这些，他准确地测量出地球，并在2000年前就得到了正确数据。

Circumference over diameter! 7,9 then 3,2,3.

看直径！7，9然后3，2，3。

I am a point — thank you — a point at the center and circumference of the infinite sphere, as my favorite author, the Argentinian Jorge Luis Borges once wrote.

我是——谢谢——我是一个位于无限球体中心和点。正如我最喜欢作家、阿根廷人豪尔赫·路易斯·博尔赫斯曾经写过那样。

Then simply measure the circumference and height of the room in metres, enter this into the calculator along with the type of surface you're painting, and it will tell you how many litres of paint you'll need.

然后只需测量间和高度（以米为单位），将这些数据连同你要粉刷表面类型一起输入计算器，它就会告诉你需要多少升油漆。

Experiments such as Georg Cantor's discovery that a single line could be divided forever and Helge von Koch's triangle — a shape that has an infinite perimeter but a finite area — resulted in the term 'monsters'.

乔治·康托尔发现一条线可以永远被分割，赫尔格·冯·科赫三角形（无限，面积有限）等实验都产生了“怪物”这个词。

It's wider, or more technically, has a greater circumference at the Equator.

它更宽，或者更严格地说，在赤道有更大。

The one that was 10 miles in circumference in the desert on Dry Lake is a Guinness World Record, largest art.

我在干湖创作10英里画作打破了世界上最大艺术品吉尼斯世界纪录。

To them pi is the ratio of a circle's circumference to its diameter.

对他们来说，π 是圆与直径之比。

The total transformed perimeter has 18 sides.

充蜡后共有 18 条边。

Utnapishtim's boat is massive, an acre in circumference, with six enormous decks.

乌特纳皮西提姆船巨大，一英亩，有六很大甲板。

The Euclid spacecraft is 4.7 meters tall and 3.7 meters around.

欧几里得航天器高4.7米，3.7米。

Oh my god. The circumference of the femur is over a foot.

我天啊。股骨超过一英尺。

It really looks very similar to a hose clamp, and what a hose clamp is is a band that's got notches so that as you turn a screw on the band, it decreases the circumference of the band itself.

它看起来真很像软管夹，软管夹是一个有缺口带子，所以当你转动带子上螺丝时，它会减小带子本身。

And this was actually something that the Greeks used, not only to prove that the Earth was round about 2000 years ago, but they actually measured the circumference of the Earth, accurate to within just a couple percent.

这是2000年前希腊人真实使用过证据，不仅用来证明地球是圆，而且他们还测出了地球，误差只有百分之几。

1,600 years before Columbus set sail, Eratosthenes not only realized the earth was round, but calculated its circumference and diameter within a few miles of their actual size.

在哥伦布出海航行 1600 年前，埃拉托斯特尼不仅发现地球是圆，还算出了地球和直径，计算结果与实际仅差几英里。

Aristotle also thought that the earth was smaller than the other planets; a claim that was challenged by Eratosthenes, who used the shadows of sundials in Alexandria and Syene to calculate the circumference of the earth.

亚里士多德还认为地球比他行星小；埃拉托色尼对这一说法提出了质疑，他使用亚历山大和赛伊尼日冕阴影来计算地球。

Short-track speed skaters (who race around a roughly 111-meter track) can go as fast as 30 miles per hour or more, and long-track speed skaters (whose track is 400 meters long) sometimes hit about 35 miles per hour.

短道速滑（冰道约为 111 米）选手时速可达 30 英里（48 千米）甚至更高，而速度滑冰（冰道为 400 米）选手时速可达近 35 英里。

Our terms were quite short. They were only eight weeks long and we had these enormous six-week long holidays when I was in medical school.

我们学期很短。只有八，当我在医学院时候，我们有非常六假期。