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Login1:10000
1cm= 0.1km
1km=10cm
therefore contour interval=20/10=2
1cm in map = 10000cm in plan
now also 1 cm in map =10000cm or 0.1km inplan
also 10cm in map = 1km
i.e no of cm per km = 10
now we know from formulae contour interval (C.I)m=( 20/ (no of cm per km ))m
=20/10
=2m
How the answer 2m