def demo_Arcs_addByThreePoints(sketch: adsk.fusion.Sketch):
# Define three points
startPoint = adsk.core.Point3D.create(0, 0, 0)
alongPoint = adsk.core.Point3D.create(5, 0, 0)
endPoint = adsk.core.Point3D.create(8, 7, 0)
# Create an arc using three points along the arc.
arcs = sketch.sketchCurves.sketchArcs
arc = arcs.addByThreePoints(startPoint, alongPoint, endPoint)