Take four identical right triangles with side lengths a and b and hypotenuse length c.

取四个全等的角三角形，两边分别长 a 和 b，斜边长 c。

The two lines on the left intersect each other at a right angle which is 90 degrees.

左边的两条线以90度的角相交。

Root 2 simply is the hypotenuse of a right triangle

而 √2 只两边长度为 1 的 角三角形之斜边。

He understood right angles and clear instruction manuals. Assembly models and drawings. Things one could draw on paper.

他理解角和清晰的产品说明，可以画到纸上的东西。

I mean, we don't make it like a sharp right angle.

的意思，不会把它剪成一个尖锐的角。

Telephone wires hum along the white roads, which always run at right angles.

电话线沿着总成角的白色道路嗡嗡作响。

Now in this example however the light came in at a straight angle.

然而现在在这个例子中，光线以角进入的。

Stilgar stood at one side motioning them into a low hole that opened at right angles.

Stilgar站在一边，示意他进入一个角开口的低洞。

A mile from the clearing he came upon the spoor of two ponies crossing his path at right angles.

离空地一英里处， 他发现两匹马的脚印以角穿过他的路。

The architecture shows stunning accuracy, prompting some archaeologists to suggest they  had instruments with which surveyors could offset right angles.

该建筑表现出令人惊叹的精确度，促使一些考古学家提出他拥有可以让测量员偏移角的仪器。

They compared the speed of light in the direction of the earth's motion with that at right angles to the earth's motion.

他比较了地球运动方向上的光速和与地球运动成角的光速。

Prim, right-angled paths neatly bordered with clamshells, intersected it like moist red ribbons and in the beds between old-fashioned flowers ran riot.

朴素的角路整齐地镶嵌着蛤壳，像潮湿的红丝带一样交叉，在老式鲜花之间的花坛里乱七八糟。

That is where she has ended up, stranded alone on a crumpled metal platform, jutting out at a right angle from the upturned deck.

她最终落在那里，孤身一人被困在一块扭曲的金属平台上，平台以角从翻转的甲板上突伸出来。

As Archer entered he was smiling and looking down on his hostess, who sat on a sofa placed at right angles to the chimney.

阿切尔进来时微笑着低头看着他的女主人，她坐在一张与烟囱成角的沙发上。

But how do we know that the theorem is true for every right triangle on a flat surface, not just the ones these mathematicians and surveyors knew about?

但怎么知道这个定理对平面上的每个角三角形都成立，而不一些数学家和测量人员所推测的呢？

Thanks to a phenomenon known as the Magnus effect (which also helps spinning balls curve), this pressure differential creates a force at right angles to the wind direction.

由于马格努斯效应（这也有助于旋转球弯曲），这种压力差会产生与风向成角的力。

It is probably not frictional forces acting on it, and so that would be easy to set up a quadrant system that looks just like this.

这很可能不摩擦力的作用，因此很容易设置一个看起来就像这样的角坐标系。

We want to know how much the height of our sphere-rectangle gets squished during this projection, which is the ratio of this hypotenuse to the leg on the right.

想知道球体矩形的高度在投影过程中被压缩了多少，这就斜边与右侧角边的比值。

At the end there was a jog in the hall and then another hall at right angles and the head of a big old-fashioned staircase with white oak bannisters.

尽头有一个在大厅里慢跑的地方， 然后另一个呈角的大厅， 还有一个带白橡木栏杆的老式大楼梯的尽头。

And the reasoning here is they both have that triple  ticked side, a double ticked side, and they're both 90-degree triangles, so this follows by the  90-degree side-side-angle congruence relation.

这里的理由它都有三条三重标记的边，两条双标记的边， 并且它都90度的角三角形，所以这符合90度边边角全等关系。