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The school plane scale is 1:30000, and the distance from the teaching building to the library is 2.2 cm.
Sorry for watching it late, I hope it will still help you.

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 (㎡).