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

学习角公理、如何计算长和面积、三维几何等等。

The Earth's circumference has been calculated to be 40,075km.

地球的长经过测量是40075公里。

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

长看直径！7，9然后3，2，3。

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的长，并在2000年前就得到了正确的数据。

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

它更宽，或者更严格地说，在赤道有更大的长。

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

对他们来说，π 是圆的长与直径之比。

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

乌特纳皮西提姆的船巨大，长一英亩，有六层很大的甲板。

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

欧几里得航天器高4.7米，长3.7米。

I mentioned that these thigh bones were 30 centimeters, a foot in circumference.

我提到过，这些大腿骨的长是30厘米，也就是一英。

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

我的天啊。股骨长超过一英。

One baobab has been seen whose trunk was thirty feet in diameter and ninety-five in circumference.

人们还曾发现过一棵树干直径长三十英、长九十五英的巨型猴面包树。

You spent the first 600 weeks of your life being a kid and 400 being a teenager.

你会花人生的前 600当个小孩， 以及400长成青年。

First, researchers took the circumference of 61 men's and women's biceps, measured their grip strength, and their height.

首先，研究人员测量了61名男女肱二头肌的长，以及他们的握力和身高。

The largest grassland on Earth, the vast Eurasian Steppe, stretches one third of the way around our planet.

辽阔的欧亚草原区是地球上最大的草原地带，覆盖距离达到地球长的三分之一。

But to get the circumference, you'd need measuring tape or a piece of string, unless there was a better way.

但要测量圆的长，你就得用卷或绳子，除非有更好的办法。

Either way, knowing the distance and the angle, and applying a little geometry, he calculated the circumference of the Earth.

不管怎样，只要知道距离和角度，再加上一点几何知识，他就能计算出地球的长。

The 20-meter-long rocket, with a diameter of two meters, is smaller than other members of the Long March rocket series.

这艘长20米、长2米的运载火箭要比其他长征系列火箭小一些。

Its height sometimes exceeds sixty feet, while the girth, or distance round the trunk, is often more than twenty feet.

它的高度有时候可以超过六十英, 而其长——也就是树干一圈的长度——则能够达到二十英之多。

So Neil do you know how far it is around the world measured at the equator-in other words, the circumference?

那么，内尔，你知道在赤道上测量地球有多远吗，换句话说，长是多少吗？

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

我在干湖创作的长10英里的画作打破了世上最大艺术品的吉尼斯世纪录。