Final answer:
When a diameter symbol is specified before the tolerance value in an angularity control, the shape of the tolerance zone is a circular zone formed by rotating a diameter through the specified tolerance angle.
Step-by-step explanation:
When a diameter symbol is specified before the tolerance value in an angularity control, the shape of the tolerance zone is a circular zone. The circular zone is formed by rotating a diameter through the specified tolerance angle around a central point. The diameter represents the maximum allowable deviation from the ideal angle, and the circular zone accounts for all possible positions of the actual angle within the tolerance range.
For example, suppose a diameter symbol of 0.02 is specified before the tolerance value of 0.10° in an angularity control. This means that the tolerance zone is a circular zone with a radius of 0.02 units, centered at the ideal angle. Any actual angle within 0.10° of the ideal angle, as measured by its maximum deviation from the diameter, is considered within tolerance.