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Chapter 10

Basic Descriptive Geometry

TermDefinition
azimuth A measurement that defines the direction of a line off due north.
bearing The angle a line makes in the top view with a north-south line.
descriptive geometry A graphic process for solving three-dimensional problems in engineering and engineering design.
dihedral angle The angle formed when two planes intersect.
frontal line A line that is parallel to the vertical plane.
grade The percentage by which land slopes.
level line A line that is horizontal in the vertical projection.
normal line A line that is perpendicular to the other two.
piercing point The point at which a line intersects a plane.
profile line A line that is parallel to the profile reference plane.
skew lines Two lines that are not parallel and do not intersect.
slope A line's angle from the horizontal reference plane.
user coordinate system (UCS) In AutoCAD, a user-defined orientation of the X, Y, and Z axes of the Cartesian coordinate system.
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