(1) According to the legend, the length of each unit line segment represents 1 km, and the distance from the library to the square is:

4÷ 1=4 (pieces),

(2) According to the legend, the length of each unit line segment represents 1km, and the distance from the school to the square is:

2÷ 1=2 (pieces),

According to the above results, draw the following figure: