Surveying
If the altitudes of a star at its upper and lower transits are 60° 30' and 19° 30' respectively, the latitude of the place, is

30°
45°
60°
35°

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Surveying
Contour interval is

Directly proportional to the flatness of ground
Inversely proportional to the scale of the map
Larger if the time available is more
Larger for accurate works

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