The height is completely fixed. What we have to choose just is where do we put that top point? Do we put it smack in the middle of a triangle or to a side or even anywhere we want?
高度定了，我们就要找它的坐标,我们要把它放在地面的中间呢,还是放在某个边的上方呢，还是随便放都可以呢？
You have a triangle with all the angles and one side; you can calculate the other sides and you should find exactly the same answer, of course.
已知三角形所有角和一个边，其它边都能求出，答案肯定与前面一致。
The hypotenuse is the longest side of a right triangle.
直角三角形的斜边是直角三角形中最长的边。
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