What type of line is medium thickness with dashed segments of equal length?

The description of a medium thickness line with dashed segments of equal length aligns with the definition of hidden lines. Hidden lines are typically used in technical drawings to represent edges and outlines that are not visible from the current viewpoint. The consistent length of the dashed segments is a key characteristic of hidden lines, making them distinguishable from other types of lines used in drafting.

In contrast, center lines are usually represented as alternating long and short dashes and are used to indicate the center of circles and arcs, while extension lines are employed to show the limits of dimensions and are typically solid rather than dashed. Construction lines, on the other hand, are often very light and are used as guides for laying out other elements of the drawing, rather than defined structures like lines with consistent dash patterns. Therefore, the characteristics of medium thickness with dashed segments of equal length uniquely identify it as a hidden line.