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The plot interval for the default geometric plot of the Ellipse.


parameter : str, optional
    Default value is 't'.


src/s/y/sympy-HEAD/sympy/geometry/tests/test_geometry.py   sympy(Download)
    assert c1.circumference == e1.circumference
    assert e3.circumference == 2*pi*y1
    assert e1.plot_interval() == e2.plot_interval() == [t, -pi, pi]
    assert e1.plot_interval(x) == e2.plot_interval(x) == [x, -pi, pi]
    assert Ellipse(None, 1, None, 1).circumference == 2*pi