def demo_GeometricConstraints_addMidPoint(sketch: adsk.fusion.Sketch):
# Create a sketch point and arc.
point = sketch.sketchPoints.add(adsk.core.Point3D.create(15, 15, 0))
arc = sketch.sketchCurves.sketchArcs.addByThreePoints(adsk.core.Point3D.create(0, 0, 0),
adsk.core.Point3D.create(10, 5, 0),
adsk.core.Point3D.create(0, 10, 0))
# Add a midpoint constraint between the point and arc
constraints = sketch.geometricConstraints
midPointConstraint = constraints.addMidPoint(point, arc)