def METHOD_NAME(vertices: ArrayLike) -> NDArrayFloat:
    """
    Close the chord.
    Parameters
    ----------
    vertices
        Vertices of the chord to close.
    Returns
    -------
    :class:`numpy.ndarray`
        Closed chord.
    Examples
    --------
    >>> close_chord(np.array([[0.0, 0.5, 0.0], [0.0, 0.0, 0.5]]))
    array([[ 0. ,  0.5,  0. ],
           [ 0. ,  0. ,  0.5],
           [ 0. ,  0.5,  0. ]])
    """
    vertices = as_float_array(vertices)
    return np.vstack([vertices, vertices[0]])