Mathematical proposition if this is the case - Training Enrollment Network

Mathematical proposition if this is the case

1, if ab=0, then a=0 or B = 0；;

2. If three sides of two triangles are equal, then the two triangles are congruent;

3. If a point is a point on the vertical line in the line segment, then the distance from this point to both ends of the line segment is equal.

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