| A | B |
|---|
| Pi | The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159. |
| Plane | A flat surface on which a straight line joining any two points would wholly lie. |
| Polygon | A closed geometric figure in a plane formed by connecting line segements endpoint to endpoint with each segment intersecting exactly two others. Polygons are classified by the number of sides they have, such as a triangle has three sides, a quadrilateral has four sides, and a pentagon has five sides. |
| Prism | A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms. |
| Quadrilateral | A four-sided polygon. |
| Radius | A straight line from the center to the circumference of a circle or sphere. |
| Rectangle | A parallelogram with 90 degree angles. A square is also a rectangle. |
| Regular Polygon | A polygon with equal angles and equal sides. |
| Revolution | Creating a 3D solid or surface by revolving a 2D shape about an axis. |
| Right Triangle | A triangle that has a 90 degree angle. |
| Rotation | Turning around an axis or center point. |
| Round | A rounded exterior blend between two surfaces. |
| Solid | A three-dimensional body or geometric figure. |
| Solid Modeling | A type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces. This allows for analysis of the object’s mass properties. |
| Space | 1. The dimensions of height, depth, and width within which all things exist and move. 2. A free or unoccupied area or expanse. |
| Square | A regular polygon with four equal sides and four 90 degree angles. |
| Surface Area | 1. The sum of all the areas of all the faces or surfaces that enclose a solid. 2. The sum of all the areas of all surfaces of a solid. |
| Tap | To cut internal threads. |
| Taper | Gradual diminution of width or thickness in an elongated object. |
| Three-Dimensional | Having the dimensions of height, width, and depth. |
| Triangle | A polygon with three sides. |
| Two-Dimensional | Having the dimensions of height and width, height and depth, or width and depth only. |
| Vertex | Each angular point of a polygon, polyhedron, or other figure. |
| Volume | The amount of space occupied by a substance or object or enclosed within a container. |
| Working Drawings | Drawings that convey all of the information needed to manufacture and assemble a design. |
