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## 1. Angle Condition

### a.Interior Angles

For a closed non-crossing loop traverse, the angle condition is:

Equation B-1 |
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Figure B-1 Angle Condtion - Loop |
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A loop traverse which crosses itself doesn’t have conventional “interior” angles so Equation B-1 won’t work. Some other angle condition must be established for such cases. | ||

Figure B-2 Crossling Traverse |

### b. Deflection Angles

If deflection angles are used, the angle condition depends on how many times, if any, the traverse crosses itself.

(a) Even crossings | (b) Odd crossings | |

Figure B-3 Deflection Angles |
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Equation B-2 | Equation B-3 |

Angle condition equations are exact so the 0°, 180°, and 360° in the equations are also exact.

### c. Link Traverse

In order to determine angular misclosure for a closed link traverses, directions must be known at both ends:

Figure B-4 Link Traverse Angle Condition |