Office building: 2x1000 = 2000 (cm) = 20 (m) 2x1000 = 2000 (cm) = 20 (m) 20x20 = 400 (㎡).
Teaching building: 5x1000 = 5000 (cm) = 50 (m)1.5x1000 =1500 (cm) =15 (m) 50x/kloc.
Library:1.5x1000 =1500 (cm) =15 (m)1x1000 =1000 (cm
Playground: 3x1000 = 3000 (cm) = 30 (m) 5x1000 = 5000 (cm) = 50 (m) 30x50 =1500 (㎡).
A * * * 400+750+150+1500 = 2800 (㎡).