def METHOD_NAME(covalent_radius):
    """The lattice parameters of the bct.
    Args:
        shannon_radius (list) : The radii of the a ions
    Returns:
       (tuple):
           float values of lattics constants and
           angles (a, b, c, alpha, beta, gamma)
    """
    a = 3.86 * covalent_radius
    b = a
    c = 2 * covalent_radius
    alpha = 90
    beta = 90
    gamma = 90
    return a, b, c, alpha, beta, gamma