It is simply the cosine of '9' multiplied by 0.25 or 1/4
$${\mathtt{0.25}}{\mathtt{\,\times\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{9}}^\circ\right)} = {\mathtt{0.246\: \!922\: \!085\: \!148\: \!75}}$$
