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Override GeometryEntity.reflect since the radius
is not a GeometryEntity.

Examples
========

>>> from sympy import Circle, Line
>>> Circle((0, 1), 1).reflect(Line((0, 0), (1, 1)))
Circle(Point(1, 0), -1)

src/s/y/sympy-HEAD/sympy/geometry/tests/test_geometry.py   sympy(Download)
    # test entity overrides
    c = Circle((x, y), 3)
    cr = c.reflect(l)
    assert cr == Circle(r, -3)
    assert c.area == -cr.area