Well if
$$\\tan\theta = 0.3465\\
then\\
\theta = atan 0.3465$$
arc tan or atan for short is the same as inverse tan
Just enter it in the site calc as
atan(0.3465)
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{tan}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.346\: \!5}}\right)} = {\mathtt{19.111\: \!201\: \!085\: \!747^{\circ}}}$$
Well if
$$\\tan\theta = 0.3465\\
then\\
\theta = atan 0.3465$$
arc tan or atan for short is the same as inverse tan
Just enter it in the site calc as
atan(0.3465)
$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{tan}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.346\: \!5}}\right)} = {\mathtt{19.111\: \!201\: \!085\: \!747^{\circ}}}$$