# constrain_angle_rsketch ## API Definition ```python def constrain_angle_rsketch(sketch: Sketch, a: Union[SketchRef, str], b: Union[SketchRef, str], value: ScalarLike, *, constraint_id: Optional[str] = None, driving: bool = True) -> Sketch ``` *Source: operations.py* ## Import Surface - top-level: `from simplecadapi import constrain_angle_rsketch` ## Description Add a driving angle constraint between two sketch lines.