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Math supplementary exercise P7, the fourth question, online, etc. ...........................................
Step 1: Make the bisector L1of two straight lines;

Step 2: Make the middle vertical line L2 of two points;

Part III: The intersection of L 1 and L2 is the demand.

1, the distance from the point on the bisector of the angle to both sides of the foot is equal;

2. The distance between the point on the vertical line in the line segment and the two endpoints is equal.