The angle of intersection of a curve is the angle between

The difference in the lengths of an arc and its subtended chord on the earth surface for a distance of 18.2 km, is only

Trapezoidal formula is also known as

Under ordinary conditions, the precision of a theodolite traverse is affected by

The vertical distance above or below the datum is called

The constant vertical distance between two adjacent contours, is called

A line normal to the plumb line at all points is known as

A fixed point of reference of known elevation is called

If the back sight and fore sight distance are kept equal during levelling observations, then the effect of both refracti…