How is the formula of the distance from a point to a straight line derived? At least 3 methods

1. Make a vertical line through points, find the intersection point and find the distance between two points;

2. Take any point on a straight line and find the minimum distance from that point to a known point;

3. Find the intersection of the plane and the straight line through the vertical plane with the point as the straight line, and find the distance between the two points; Writing a plane requires knowledge of spatial analytic geometry. )

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