The purpose of hidden lines is to represent edges that are not directly visible. The purpose of center lines is to represent the axes of circular features.
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The hidden line is drawn, however, the edges of the center line can still be seen ( the center line ends up appearing as extra long dashes on either side of the end of the hidden line)
the line which is not seen
The short dotted lines are the type of lines on a drawing that are designed to represent the hidden details.
A circle has infinite lines of symmetry, any line going through the center is a line for symmetry.
Used for drawing horizontal lines. To support set squares when drawing vertical line and inclined lines.