为了描述人类，他应该保持手掌与地面成直角。
In order to describe human beings, he should keep the palm of his hand at a right angle to the floor.
球呈直角偏离弹了出去。
直角为90度。
根据科学的结果，在冬至，太阳和南回归线形成了一个直角。
According to scientific results, on Winter solstice, a right angle is formed by the sun and the tropic of carpricorn.
第一种是几何办法，这是一个直角。
One is to argue geometrically that you have a right angle in here.
代码示例3：直角三角形测试。
代码示例8：保护直角三角形的属性。
你就得到一个直角三角形。
如果在这画条线段，那这里就是个直角。
If you draw this segment in here, you know that here you have a right Angle.
假设，我想保留这个直角。
给定周长寻找直角三角形。
直角三角形和欧几里德范数
把一个函数，在直角坐标和极坐标中转换。
You have a function that you want to switch between rectangular and polar coordinates.
只用拇指和手指，从中间把它弯曲成直角。
Using just thumbs and fingers, bend it in the middle to form a right-angle.
代码示例7：用于检验直角三角形的代码。
我们有直角坐标系，有柱坐标系和球坐标系。
We have rectangular coordinates, we have cylindrical coordinates and we have spherical coordinates.
你的腿比等腰直角三角形漂亮多了。
为了简化算法实现，假设墙的转弯都是直角的。
To simplify the algorithm implementation, I'll assume that walls are laid out at right angles.
代码示例6：在主测试中检查是否为直角三角形。
当旋转这个边时，这个角就不再是直角了。
When we rotate this side here, but the Angle doesn't stay at a right Angle.
代码示例5：添加对非直角三角形的测试。
然后，在同一个地方，把它弯回去形成反方向的直角。
Then, at the same place, bend it back to form a right-angle in the opposite direction.
或者还是用极坐标系，这比直角坐标系更好。
Or I can use polar coordinates,and it works a little bit better that way.
图案的变换说明直角臂的相对长度发生了变化。
Any shift in the position of those regions tells you that the relative lengths of the arms has changed.
先选择哪种可能的情况无关紧要，因此我选择直角三角形。
It doesn't matter which possibility I choose first, so I pick a right triangle.
当你走近它时，会看到每个水平部分由两个互为直角的单元组成。
When you get closer, you see that each horizontal section is made up of two pieces that converge in a right angle.
当你走近它时，会看到每个水平部分由两个互为直角的单元组成。
When you get closer, you see that each horizontal section is made up of two pieces that converge in a right angle.
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