Jawabanmu

2014-02-28T12:23:05+07:00
S = jp/js
=12 / 20.000.000
=1/16666666
maybe
2014-02-28T12:31:04+07:00
Jarak pd gambar=12 cm
jarak sebenarnya= 200km
=200x100.000
=20000000

12:12             = 1
20000000:12  =1666666,7

skala yg digunakan : 1:1666666,7