... middle point of a triangle 三角形的重心 middle point triangle 中点三角形 middle term 中项 ...
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middle point of a triangle 三角形的重心
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？
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