intersection of border and route in google maps -

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when have specific area of operation (like city or town) travel point in area point b outside of area how can check exact point of intersection of route , border of area on google map?

ts -> [ c ] -> b
, b start , finish point of route , c exact point route / border - need distance (a;c) , distance (c;b) information c (intersection of route , border)

its urgent me,

cheers, marcin


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