Question

The difference between the fore bearing and back bearing for any station is equal to ________

• A. Right angle
• B. External angle
• C. Internal angle
• D. Either external or internal angle

Answer 1

The correct option is C Internal angle

(b)
$\bullet$ Where two lines meet at a point, the angle between them is called as included angle.

$\bullet$ Included angle can be either interior angle or exterior angle.

$\bullet$ It will always be measured in clockwise direction from preceding line succeeding line.

$Includedangle=Forebearingofnextline-Backbearingofpreviousline$
$\bullet$If traversing clockwise $\Rightarrow$ included angle will be exterior angle.
$\bullet$If traversing anti-clockwise $\Rightarrow$ included angle will be interior angle.