⑴? The distance from point A to line BC is the length of line segment AC (as shown in figure 1), and the distance from point B to line AC is the length of line segment BC (as shown in figure 2);
⑵AB is the longest;
∫ Of all the line segments between a point outside the connecting line and each point on the line, the vertical line segment is the shortest;
∴ AC < AB (as shown in figure 1), BC < BA (as shown in figure 2).