def quadratic_points(x1, y1, x2, y2, x3, y3):
    """Return the quadratic points to create quadratic curves."""
    xq1 = x2 * 2 / 3 + x1 / 3
    yq1 = y2 * 2 / 3 + y1 / 3
    xq2 = x2 * 2 / 3 + x3 / 3
    yq2 = y2 * 2 / 3 + y3 / 3
    return xq1, yq1, xq2, yq2, x3, y3