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Classical wrong questions of mathematics in the first day of junior high school
Point P is a little outside the straight line M, and points A, B and C are three points on the straight line M, with PA=4cm, PB=5cm and PC=2cm, so the distance from point P to the straight line M will not be PA, PB.

The distance from point P to line M is at most equal to PC=2cm, or less than 2, but greater than 0.