auxiliary line
line that helps with the proof
An auxiliary line, also known as a construction line, is a thinly drawn, light-colored line used in technical drawing to aid in the placement and measurement of other lines and objects. These lines are typically drawn using a drafting instrument such as a straightedge or a compass and do not appear in the final drawing.
Auxiliary lines are commonly used to indicate the location, dimension, or orientation of other objects on a drawing, without directly affecting the final image. For example, a designer may use an auxiliary line to locate the center of a circle, or to connect the endpoints of several lines to form a triangle.
The use of auxiliary lines can help to ensure accuracy and consistency in technical drawings, and can also provide useful guidance for others who may be interpreting or working with the drawing. However, it is important to keep in mind that auxiliary lines should not be confused with actual drawn lines, and should be removed from the final drawing where possible to avoid confusion.
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