Which part of a vernier bevel protractor is used as the reference surface while measuring an angle?
Stock
A vernier bevel protractor measures the angle between two surfaces of a workpiece.
The stock (also called the base or body) is the fixed part that is placed firmly against one face of the work; it acts as the reference or datum surface from which the angle is measured.
The blade is the movable arm that is set against the second surface, while the vernier scale and the dial are used only to read the angular value, not to reference the work.
Because the stock is the fixed face rested on the workpiece, it provides the measuring reference.
Hence, the answer is Stock.
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