这个平行四边形的面积是多少？
每个平行四边形的面积各是多少？
那么现在这个平行四边形的面积是多少？
七年级数学要学的东西确实挺难：比例、小数、平行四边形的面积。
The kinds of things you need to learn in seventh grade math, sure, they're hard: ratios, decimals, the area of a parallelogram.
答案是5，目前为止，这个平行四边形的面积,是那个正方形面积的5倍。
That's 5. OK, this parallelogram is apparently five times the size of this square.
这个平行四边形仍然有相同的面积，它仍然在同一个平面上。
The parallelogram still has the same area, and it's still on the same plane.
当然这个平行四边形还是有同样的面积，也在同一个平面上。
Sure, the parallelogram still has the same area, and it's still in the same plane.
在曲面上做一些网格，你会看到一个网上的每一小块儿，都是小的平行四边形，我们要弄清楚它的面积和法向量是什么。
You will get some sort of mesh grid on your surface and you will look at a little parallelogram that is an elementary piece of that mesh and figure out what is its area and normal vector.
这面积，约等于平行四边形的一半，我能用向量表示它。
So, the area is approximately equal to one half of the area of a parallelogram that I could form from these vectors.
每个三角形的面积等于拼成的平行四边形面积的。
The area of every triangle equals the area of the parallelogram.
师：已知平行四边形的底和高，就可以求出它的面积。
Teacher: We can work out the area of a parallelogram if we know the base and height of it.
该模型认为，当主干与侧枝的截面积之间存在类似平行四边形法则的关系时，分枝的体积取极小值。
This model suggests that, when the relation "parallelogram rule" exists between main stem and sub branches, the total volume of branches is minimal.
该模型认为，当主干与侧枝的截面积之间存在类似平行四边形法则的关系时，分枝的体积取极小值。
This model suggests that, when the relation "parallelogram rule" exists between main stem and sub branches, the total volume of branches is minimal.
应用推荐