Center Lines are used to represent symmetry , and to mark the centres of the circles and the axes of symmetrical parts, such as cylinders and bolts.

Break Lines are freehand lines used to show where an object is broken to reveal interior features.

Dimension and Extension lines are used to indicates the sizes of features on a drawing.

Section Lines are used in section views to represent surfaces of an object cut by a cutting plane.

Visible lines are used to represent features that can be seen in the current view.

Hidden Lines are used to represent features that cannot be seen in the current view.


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