A well conditioned triangle has no angle less than

The included angles of a theodolite traverse, are generally measured

Perpendicularity of an offset may be judged by eye, if the length of the offset is

The angle of intersection of a curve is the angle between

A fixed point of reference of known elevation is called

Accidental or compensating errors of length L are proportional to

An advantage of plane tabling is

In order to determine the natural features such as valleys, rivers, lakes etc., the surveying preferred is

Spirit level in plane table is used for