# Dictionary:Angles (surveying)

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The direction of a survey leg with respect to the preceeding leg of the survey traverse. Several measuring conventions are used (Figure A-13). The first leg of the traverse is usually specified by azimuth or compass direction. **Azimuth angles** are measured clockwise with respect to north (either true north or magnetic north), occasionally with respect to south. **Interior angles** are the angles lying inside a closed traverse. **Angles right** are measured clockwise after backsighting on the previous station. A **deflection angle** is the angle between the onward extension of the previous leg and the line ahead.

FIG. A-13.
**Angle measuring conventions**. Specifying by (**a**) **interior angles**, (**b**) **angles right**, (**c**) **deflection angles**, (**d**) **azimuth angles**. The first leg of a loop is specified by azimuth.