Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Tangents of two adjacent parts
Cosines of two adjacent parts
Sines of two adjacent parts
Both (A) and (B) above

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Surveying
Pick up the correct statement for horizontal photographs.

Parallel lines do not appear parallel in central projection
The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines
All listed here

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Every angle is less than two right angles
Sum of the three angles less than six right angles and greater than two right angles
Sum of the three angles is equal to two right angles
Sum of any two sides is greater than the third

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of AB differ by 180°
the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct

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