Which statement best defines perpendicularity and angularity?

• A. Perpendicularity is 90 degrees to a datum; angularity is any specified angle to a datum.
• B. Perpendicularity is parallel to the datum; angularity is perpendicular to the datum.
• C. Perpendicularity is any angle to a datum; angularity is 90 degrees to a datum.
• D. Perpendicularity controls the profile; angularity relates to runout.

Answer: (B)

Perpendicularity is about being at a right angle to the reference datum, while angularity specifies a particular, defined angle to that datum. So, a perpendicularity tolerance enforces a 90-degree relationship to the datum, and an angularity tolerance enforces a specified angle (which could be any value given in the drawing) to the datum. The best description matches that understanding, emphasizing the 90-degree constraint for perpendicularity and the defined angle for angularity. The other phrasing confuses the relationships between the terms, which isn’t how these tolerances control orientation.