Surveying
The net ground area of a vertical photograph 20 cm × 20 cm on scale 1 : 10,000 having overlaps 60% and 30%, is

0.60 sq km
0.64 sq km
0.50 sq km
0.56 sq km

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Surveying
The meridian of a place is

A great circle passing through the place and the poles
A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator

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