The scale "4 cm = 1 m" is a factor of 1:25 (1/25th scale). 1m/.04m = 25
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1cm = 10mm, so 4cm = 40mm. 1m = 100cm or 1000mm.
Well, if 4cm is 12 km, and there are five 4cm in 20cm, 12*5=60, so:There are 60km in a distance of 20cm on a map with a scale of 4cm to 12km.
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to work out the scale we take the number of mm in 1m =1000 and then divide by the scale factor in this case 1:75 so 1000 divided by 75 = 13.333333333333333
It is an equilateral triangle