Which type of line is used to represent the center of a circle, arc, or any symmetrical object in an engineering drawing?
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The center of a circle, arc, or symmetrical object is represented by a thin dashed line known as a center line. Center lines are drawn with long dashes alternating with short dashes. They help to identify the center point or axis of symmetry of the object. Center lines are useful in indicating the rotational symmetry and the alignment of features in an engineering drawing.