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technical design/maps/geography

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The scale of a map is 9mm represent 1km on real ground. I found the area of the map and it is 19990mm2. How am I going to use the scale to find the area of the real ground? Thanks a lot!

  • technical design/maps/geography -

    If the scale is 9mm/1km, then the area scale is that squared, or 81squaremm per 1 km^2

  • Thanks -

    Thank you so much for your help!

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