Surveying
There are two stations A and B. Which of the following statements is correct?

All listed here
The fore and back bearings of AB differ by 180°
The back bearing of AB is BA
The fore bearing of AB is AB

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up

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