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Remind: scale = drawing / reality
Then
reality 50m x 20 m
Format A0: 1189mm x 841mm
Plotter: 840 mm
scale H = 1189 / 50000 = 1/42 Scale H = 1/50
scale V = 841 / 20000 = 1/23 Scale V = 1/25
Max scale = 1/50