def demo_GeometricConstraints_addSymmetry(sketch: adsk.fusion.Sketch):
# Create two sketch circles.
leftCircle = sketch.sketchCurves.sketchCircles.addByCenterRadius(adsk.core.Point3D.create(2, 3, 0), 3)
rightCircle = sketch.sketchCurves.sketchCircles.addByCenterRadius(adsk.core.Point3D.create(10, 5, 0), 2)
# Create a sketch line.
symmetryLine = sketch.sketchCurves.sketchLines.addByTwoPoints(adsk.core.Point3D.create(6, 0, 0),
adsk.core.Point3D.create(6, 7, 0))
# Add a symmetric constraint to make the circles symmetric around the line.
constraints = sketch.geometricConstraints
symmetryConstraint = constraints.addSymmetry(leftCircle, rightCircle, symmetryLine)