CST Level 1 Land Surveyor Certification Practice

Which of the following describes the types of horizontal angles?

1. Only deflection angles

2. Interior, exterior, and deflection angles

3. Zenith, azimuth, and bearing angles

4. Vertical, horizontal, and diagonal angles

The correct answer is: Interior, exterior, and deflection angles

The types of horizontal angles are best described by the classification that includes interior, exterior, and deflection angles. Interior angles are those formed within a closed polygon or between two lines that converge at a common point, crucial for various surveying calculations, especially in closing survey loops. Exterior angles, on the other hand, are the angles formed outside of the polygon when extended lines of a polygon are considered. These angles are useful in determining alignment and project layout, as they relate to the orientations outside the main figure. Deflection angles specifically refer to the angle that a line makes as it turns from the extension of a previous line, representing how much a surveyor needs to turn from a reference alignment to establish a new direction. This classification is foundational in land surveying as it helps in accurately determining positions, establishing boundaries, and facilitating navigation and construction. Understanding these angle types is pivotal to ensuring precise work in field measurements and layouts.