M6-Ex1 A magnetic bearing of 44° 00' was observed along line XY in June 1997. The declination for the area surveyed is found by interpolation from an isogonic chart dated 1990 to be 7° 30' E with an annual change of l.5' eastward. Compute the azimuth of the line XY.

M6-Ex2 A measurement was made along a line that is inclined by a vertical angle of 3° 22' as measured using an engineering transit. To what accuracy must the slope angle be measured, if the relative accuracy of the horizontal distance is to be 1 in 25,000 ? Derive the relation used before calculation.

M6-Ex3 A theodolite having graduation 0° to 360° in clockwise direction on its circle, is used to measure an angle by clockwise repetition. Equal number of readings were taken with telescope normal and inverted. The observations are as under :

Compute the value of the angle.

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