Mark the location of buildings in the campus on the plane. (1) The Children's Palace is 300 meters north of the teaching building. (2) The reading room is 30 degrees northeast of the teaching building. Because the distance of 1 cm on the map represents the actual distance of 100 m,

Then the distance from the Children's Palace to the teaching building is: 300÷ 100=3 (cm).

The distance from the library to the teaching building is 300÷ 100=3 (cm).

The distance between the laboratory and the teaching building is 400÷ 100=4 (cm).

Because the Children's Palace is just north of the teaching building,

The library is 30 degrees northeast of the teaching building.

The laboratory is 45 degrees southwest of the teaching building.

So the location of the Children's Palace, the library and the laboratory is as shown in the following figure: