Angles are usually measured using protractors.

角度通常用量角器进行测量。

And he didn't use a protractor to make those perfect letters or any other kind of measurements.

他没有使用量角器或任何其他测量方式来做出那些完美字母。

Protractors have markings on them, similar to rulers, but instead of inches or centimeters it measures in degrees.

量角器上有何直尺类度，但是其度是英寸或者是，是以度来衡量。

Be protractor, in maths we're doing all angles, I absolutely needed this to do any maths lesson.

当量角器，数学课上我们要测量各种角度，我完全需要这个来上任何数学课。

So definitely the tool used to measure an angle is a protractor, not a new tractor or whatever it was that you said.

所以， 用来测量角度工具绝对是量角器，是什么新拖拉机或者你说其他东西。

If you don't have a protractor to measure with, you can estimate how big it is as long as you remember what a 90 degree angle, 180 degree angle, and 360 degree angle look like.

如果你没有量角器，你可以估计它有多大，只要你记得 90 度角，180 度角和 360 度角是什么样子就行了。

You can actually, it's hard to show that the Earth is curved, but you can show the Earth is curved using triangles, mountaintops, et cetera, if you have an accurate enough protractor.

实际上，虽然很难直接展示地球是弯曲，但借助三角形、山顶等工具，如果你有一个足够精确量角器，就能证明地球曲率。

And if we actually put a protractor on and start to measure that you can see that the measurement on the left side, between zero and that angle, is going to match exactly the angle on the right side.

如果我们实际放一个量角器并开始测量，您会发现左侧测量值（零点和该角度之间）将与右侧角度完全匹配。