Dimension lines are usually placed between two _______ lines?

Dimension lines are typically placed between two extension lines. This is because extension lines are used to extend the features of the object to the dimension line, which indicates the measurement. The purpose of the dimension line is to provide the actual measurement of the distance between the two extension lines, enhancing the clarity and understanding of the dimensions on a technical drawing. This placement ensures that the measurements are accurately represented and easy to read for anyone interpreting the drawing.

In technical drawings, maintaining proper spacing and arranging dimension lines correctly is crucial for conveying dimensions clearly and precisely. Doing so helps avoid confusion and ensures that the measurements are correctly associated with the features they represent.