It is often used to find the distance in function graphics, and then to find the coordinates of points by distance.
The coordinates of points A and B are known to be A(x1,y1)，B(x2,y2)
The square of distance AB between two points is
After calculating the distance AB.
For example, the coordinates of points A and B are known to be A(1,2)，B(4,6)
It can also be calculated directly. :
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