Assume a clockwise winding order. Calculate the normalized normal vector for the

triangle rendered by the following code segment, assuming that OpenGL uses a left$-$hand

coordinate system where the x$-$axis extends to the right and the y$-$axis extends upward.

glBegin$($GL$\_$TRIANGLE$\_$FAN$)$;

glVertex$2$f$(0\mathrm{.}4,0\mathrm{.}4)$; glVertex$2$f$(-0\mathrm{.}3,0\mathrm{.}2)$;

glVertex$2$f$(0\mathrm{.}2,-0\mathrm{.}3)$;

glEnd$()$;