A circle actually has infinite axis of symmetry, except poor Mr. Parallelogram, no access for you.

圆实际上有无限的称轴，除了可怜的平行四边形先生，你无路可走。

The kinds of things you need to learn in seventh grade math, sure, they're hard: ratios, decimals, the area of a parallelogram.

，数，还要算平行四边形的面积。

Stephen lay watching the Great Bear; Elfride was regarding a monotonous parallelogram of window blind.

史蒂芬躺在那里看着大熊。 Elfride 正在考虑一个单调的平行四边形百叶窗。

After the transformation, that square gets turned into the parallelogram that we care about.

变换之后 这个正方形就变成了我关心的平行四边形。

The servants cut our bread into cones, cylinders, parallelograms, and several other mathematical figures.

仆人把我的面包切成圆锥体、圆柱体、平行四边形和其他几种数学图形。

That way, a vector with negative y-coordinate would correspond to a negative area for this parallelogram.

这样，具有负 y 坐标的向量将该平行四边形的负面积。

Where before you had a nice rectangular-looking book, now you have more of a … parallelogram.

以前，这本书是长方形的。 现在它更像一个平行四边形。

The cross product of VNW, written with the X shaped multiplication symbol, is the area of this parallelogram.

VNW的叉乘 用X形乘法符号表示 就是这个平行四边形的面积。

We'll start in two dimensions. If you have two vectors V and W, think about the parallelogram that they span out.

我从二维开始 如果有两个向量V和W 想想它张成的平行四边形。

Its length equals the area of the parallelogram defined by vn W.

它的长度等用vnw定义的平行四边形的面积。

As you apply some matrix transformation, the areas of the parallelograms don't stay the same, they may get scaled up or down.

当您用一些矩阵变换时，平行四边形的面积不会保持不变，它可能会按例放大或缩。

Actually, to be more accurate, you should think of the signed area of this parallelogram, in the sense described by the determinant video.

实际上，为了更准确， 您该考虑该平行四边形的有符号面积，就像行列式视频所描述的那样。

Look at the parallelogram we defined earlier, which encodes the excordinate of the mystery input vector spanned by that vector.

看看我之前定义的平行四边形 它编码了神秘输入向量由该向量张成的横坐标。

That way, a vector with a negative Y coordinate, I would correspond to a negative area for this parallelogram.

这样 一个Y坐标为负的向量 就了这个平行四边形的负面积。

But if V is on the left of W, then the cross product is negative, namely, the negative area of that parallelogram.

但是如果V在W的左边 那么叉乘就是负的 也就是平行四边形的负面积。

Take the parallelogram defined by the 1st basis factor I had, and the mystery input vector X-Y.

取由第一个基因子定义的平行四边形 以及未知的输入向量X-Y。

Basically, if V is on the right of W, then V cross W is positive and equal to the area of the parallelogram.

基本上 如果V在W的右边 那么V叉乘W是正的 等平行四边形的面积。

Look at that parallelogram we defined early which encodes the x-coordinate of the mystery input vector, spanned by the input vector and j-hat.

看看我之前定义的平行四边形， 它编码了神秘输入向量的 x 坐标，由输入向量和 j-hat 跨越。

Well, this is the transformed version of that parallelogram we were looking at earlier, whose area was the y-coordinate of the mystery input vector.

嗯， 这是我之前看到的平行四边形的变换版本，其面积是神秘输入向量的 y 坐标。

So the area of that parallelogram is a sort of screwy, roundabout way to describe the vector's Y cordon.

所以平行四边形的面积是一种扭曲的 迂回的方式来描述矢量的Y线。