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An angularity specification controls how much the feature can deviate from a specified angle to a datum Sometimes you can use a secondary datum to control the tolerance zone's orientation For this geometric tolerance, these three aspects work together Each considered feature and each resulting toleranced featureAnswer to When an angularity tolerance is applied to a planar surface, the tolerance zone is two parallel planesSo geometric tolerance is defined which limits the amount a surface, axis, or center plane is permitted to vary from being perpendicular to a datum which is known as perpendicularity control It creates a tolerance zone that consists of two parallel planes separated by the geometric tolerance Angularity Dimensional Consulting Perpendicularity tolerance zone