def determine_angle_label(angle: str) -> str:
    """ Determine the full angle label and return the corresponding latex.

    Args:
        angle: Angle to be used in the label.
    Returns:
        Full angle label.
    """
    return_value = r"$\Delta"
    # Need to lower because the label in the hist name is upper
    angle = angle.lower()
    if angle == "phi":
        # "phi" -> "varphi"
        angle = "var" + angle
    return_value += r"\%s$" % (angle)
    return return_value