8) On a Photo scale of 1:40,000 a square shaped open cast coal mine of 1 km2 area would have an area of ___ cm2.
(Thanks
to Chandrasekhar, ANU)
Solution:
Given
that the scale 1:40,000
1
cm = 40000 cm
1
cm = 40,000 * 10-5 km
1
cm= 0.4 km
1
km=1/0.4 cm
1
km = 2.5 cm
From
the given data we have 1 km2 area = (2.5 cm)2
1 km2 =
6.25 cm2
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