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| Orthographic Drawing | A two-dimensional drawing of a three-dimensional object, using two or more additional drawings to show additional views of the object. It is also known as an orthographic projection. |
| Front View | A projection view obtained by drawing perpendiculars from all points on the edges of the part to the frontal plane of projection. (Length/Height) |
| Top View | A projection view obtained by drawing perpendiculars from all points on the edges of the part to the top plane of projection. (Width, Length) |
| Side View | A projection view obtained by drawing perpendiculars from all points on the edges of the part to the right-side plane of projection. (Height, Width) |
| Hidden Lines | It is standard practice to use dashes to represent any line of an object that is hidden from view. |
| Apex | The starting point for each of your drawings. Always remember that each perspective should be an inch apart. |
| Diameter | A straight line passing from side to side through the center of a body or figure, especially a circle or sphere |
| Length | (Front View) Left to Right measurement |
| Width | (Top View) - Front to Back measurement |
| Height | (Side View) - Bottom to Top measurement |
| Radius | A straight line from the center to the circumference of a circle or sphere |
| Perspective | A view of a three-dimensional image that portrays height, width, and depth for a more realistic image or graphic |
| Measurement | The assignment of a number to a characteristic of an object |
| Object Lines | These (solid) lines define the shape of the object portrayed and are the outermost outline of the object. |
| Dimension Lines | A measurable extent of some kind, such as length, width, depth, or height. |
| Metric System | Uses the measuring units such as meters and grams and adds prefixes like kilo, milli, and centi, to count orders of magnitude |
| The Imperial System | (American Standard) - Measurements are taken in feet, inches and pounds. |
| Super Inch | the fractional measurement of the 16 digits marked on a ruler or tape measure used to measure dimension |
| Orthographic projection | Another name for orthographic drawing. |
| The Imperial System | After the U.S gained independence from Britain, the new American government decided to keep this type of measurement, even though the metric system was gaining in popularity at the time. |
