if a farm boundary is 8km long, what would the length in mm on a 1:50000 topographic map be?
1:50000 means that 1 cm on map represents 50,000 cm in the real world, i.e. 1 cm is equivalent to 0.5 km. Since 8 km is 16·0.5 km, then the farm boundary will be 16 cm.
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