Surveying
Three point problem can be solved by

All of these
Tracing paper method
Tracing paper method
Lehman’s method

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Surveying
The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same

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Surveying
In triangulation surveys

The area is divided into triangular figures
All listed here
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line

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