Question

跪求翻译~~~~~

Everyone knows that the apparent size of an object depends on its distance from
the viewer. The farther away an object, the smaller its apparent size. The apparent
size is determined by the angle the object subtends at the eye of the viewer.
If you are looking at a painting hanging on a wall, how far away should you
stand to get the maximum view? If the painting is hung above eye level, then the
following figures show that the angle subtended at the eye is small if you are too
close or too far away. The same situation occurs when choosing where to sit in a
movie theatre.
The screen in a theatre is 22 ft high and is positioned 10 ft above the floor,
which is flat. The first row of seats is 7 ft from the screen and the rows are
3 ft apart. You decide to sit in the row where you get the maximum view, that
is, where the angle u subtended by the screen at your eyes is a maximum.
Suppose your eyes are 4 ft above the floor, as in the figure, and you sit at a
distance x from the screen
Use a graphing device to graph u as a function of x. What value of
x maximizes u? In which row should you sit? What is the viewing angle
in this row?

Answer 1

每个人都知道一个物体的表观大小取决于它的距离
观众。天体的距离越远，它的外观尺寸较小的。明显的
尺寸由角的对象包含在观众的眼睛确定。
如果你看一幅画挂在墙上，如何远离你
获得最大的观点？如果这幅画挂在眼睛的水平，然后
以下的数字表明，如果你太角的眼睛是小的
近或太远。同样的情况发生时，选择在哪里坐在
电影院。
在剧院的屏幕是22英尺高，位于10英尺以上的地面，
这是平的。第一排座椅是从屏幕7英尺和行
相距3英尺。你决定坐在那里你得到最大的观行，，
是，在角u被屏幕上的你的眼睛是一个最大的。
假如你的眼睛是4英尺以上的地面，如图，和你坐在一个
从屏幕的距离x
使用绘图装置图为x的函数值什么
X最大化吗？你应该坐在哪排？什么是可视角度
在这一行的？

请采纳

Answer 2