def METHOD_NAME(mask_model):
    x0 = 2.0
    y0 = 3.5
    r = 1.2
    phi1 = 0.1
    phi2 = 1.3
    phi3 = 6.0
    p1 = QtCore.QPointF(x0 + r * cos(phi1), y0 + r * sin(phi1))
    p2 = QtCore.QPointF(x0 + r * cos(phi2), y0 + r * sin(phi2))
    p3 = QtCore.QPointF(x0 + r * cos(phi3), y0 + r * sin(phi3))
    mask_model.find_center_of_circle_from_three_points(p1, p2, p3)
    assert pytest.approx(x0) == mask_model.center_for_arc.x()
    assert pytest.approx(y0) == mask_model.center_for_arc.y()