What type of lines should extension, dimension, and leader lines be drawn with?

Extension, dimension, and leader lines are critical in technical drawings as they provide clarity and precision in conveying measurements and design intent. They should be drawn with thin, sharp, crisp lines to ensure they are easily distinguishable from other features in the drawing. This choice helps in maintaining the overall readability and professionalism of the technical document.

Using thin lines prevents the extension and dimension lines from overpowering the primary objects in the drawing while still being visible and providing the necessary information. Crisp lines also enhance the precision of the drawing, making it easier for the reader to understand the exact measurements and relationships between different elements.

Thick or blunt lines would detract from the clarity of the dimensions, causing confusion and potentially leading to misinterpretation of the scale. Wavy or uneven lines would make it difficult to read the measurements accurately, undermining the precision that is essential in technical drawings. Therefore, the use of thin, sharp, crisp lines is the proper standard for representing these elements in architectural and engineering graphics.