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Spatial geometry
1m= 1000mm

1:500,

20m=20000mm，20000/500=40mm

5m = 5000mm,10mm

10m= 10000mm，20mm

8m=8000mm， 16mm

The length, width and height of a cuboid and the height of a pyramid should be 40mm, 10mm, 20mm and 16mm respectively.

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