# add_arc_rsketch ## API Definition ```python def add_arc_rsketch(sketch: Sketch, entity_id: str, start: Union[SketchRef, str], end: Union[SketchRef, str], center: Union[SketchRef, str], *, construction: bool = False) -> Sketch ``` *Source: operations.py* ## Import Surface - top-level: `from simplecadapi import add_arc_rsketch` ## Description Add an arc entity to a sketch.