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

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the three angles of a plane triangle should be 180°
All listed here
The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°

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