Are the lines perpendicular to each other?
这些直线相互垂直吗？
The sides of the mountain are almost perpendicular.
山的两侧几乎是垂直的。
The wall is a little out of the perpendicular.
墙壁有点倾斜。
The left wing dipped until it was perpendicular to the ground.
左翼下垂至与地面成90度角。
We made two slits for the eyes and a perpendicular line for the nose.
我们划了两道缝儿做眼睛,一条竖线做鼻子。
When a surface is perpendicular to the rays, their intensity is at its maximum.
当表面与射线垂直时，射线的强度最大。
一个与半径垂直的矢量。
So, it's perpendicular to my curve.
它垂直于曲线。
should be perpendicular to the level set.
必须与水平集垂直。
And the force is perpendicular to the arm.
力是垂直于杆。
So it's still perpendicular to the same plane.
所以这个外积还是垂直于同一个平面。
And it will still be perpendicular to the curves.
它还是垂直于那些曲线。
This was evident from the perpendicular wrinkles.
这可以从那些垂直的折皱上看出来。
Well, it's the direction that's perpendicular to this plane.
它其实是朝垂直于平面的方向。
You might be able to draw curves that are perpendicular to it.
或许你可以画出每点都垂直于向量场的曲线。
The gradient vector would be going perpendicular to the level.
梯度向量应该垂直于等值线。
The lighter should sit perpendicular to the neck of the bottle.
打火机应该与瓶颈垂直。
And these forces are both perpendicular to the displacement.
这些力都在位移的垂直方向上。
And then there is the normal force perpendicular to the surface.
这个力，垂直于斜面。
So, how do we find this vector that's perpendicular to the plane?
所以，我们要怎么找，垂直于这个平面的向量？
And so it was rotating like this and was perpendicular to the disk.
它这样旋转，垂直于圆盘。
Do you mean how do I know that it is perpendicular to a level curve?
你想问的是，我如何知道它是和等高线垂直的吗？
We have seen that the gradient is perpendicular to the level surface.
我们已经知道，梯度是垂直于等值面的。
That means that the gradient of f is perpendicular to the level set of g.
也就是说f的梯度向量,应该与g的水平集垂直。
These two vectors are perpendicular exactly when their dot product is zero.
当点乘的数量积为零时,这两个向量垂直。
And I will call this direction y, as I always do perpendicular to the surface.
照惯例把垂直方向，设为y方向。
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