Question

Figure below shows an open traverse PQRS, where P is the starting point of traverse and S is the end point of traverse. Which one of the following is correct? 

• A. $\angle R = {Bearing} = 32^\circ$, $\angle P = {Deflection Angle} = 75^\circ$, $\angle Q = {Included Angle} = 120^\circ$
• B. $\angle P = {Bearing} = 75^\circ$, $\angle Q = {Deflection Angle} = 120^\circ$, $\angle R = {Included Angle} = 32^\circ$
• C. $\angle P = {Bearing} = 75^\circ$, $\angle R = {Deflection Angle} = 32^\circ$, $\angle Q = {Included Angle} = 120^\circ$
• D. $\angle R = {Bearing} = 32^\circ$, $\angle Q = {Deflection Angle} = 120^\circ$, $\angle P = {Included Angle} = 75^\circ$

Hint:

In a traverse, bearings are taken from the meridian, deflection angles represent deviation from the previous line, and included angles are internal angles between two connected lines.

Answer 1

The Correct Option is C

From the figure:

- At point $P$, the line makes an angle of $75^\circ$ with the magnetic meridian, hence bearing at $P = 75^\circ$.
- At point $Q$, the angle between lines $PQ$ and $QR$ is an internal included angle of $120^\circ$.
- At point $R$, the angle between $QR$ and $RS$ is a deflection of $32^\circ$.

Thus, the correct interpretation of each angle is:
- $\angle P = {Bearing} = 75^\circ$
- $\angle R = {Deflection Angle} = 32^\circ$
- $\angle Q = {Included Angle} = 120^\circ$