| A | B |
|---|
| Angle | The figure formed by the intersection of two lines at a point. |
| Circle | A closed curve with coplanar points at the same distance from the center point. |
| Contour | An outline, especially of something curved or irregular. |
| Diagonal | A line that is slanting or oblique. |
| Edge | The line where two surfaces or points intersect. |
| Ellipse | The group or set of all points in the same plane whose sum of distances from two points (foci) is constant. It looks like a squashed circle. |
| Essence | The quality or nature of something that identifies it or makes it what it is. |
| Freehand | Done without the use of tools or drawing equipment. |
| Horizontal | A line parallel to the horizon. |
| Line Segment | A portion of a line that is defined by two points. |
| Line Weight | The width and darkness of a line. |
| Line | The path of an infinite series of points. A straight arrangement of points that extends indefinitely in both directions without width or thickness. |
| Object | Something visible or tangible. |
| Object Line | Slightly lighter than a profile line, used to add all details to a sketch. |
| Pattern | A regular or repeated design, form, order of arrangement. Can be circular or rectangular. |
| Profile Line | In sketching, a dark heavy line that outlines the object drawn. |
| Shape | The physical geometry of a model. |
| Sketch | A freehand drawing of an idea or solution to a problem without concern for detail,which could be done either on paper or on a computer. |
| Surface | A two-dimensional area on a plane. |
| Vertical | Perpendicular to the horizon. |
| Visualization | To form a mental image of something. |
