Exercise $4.$ 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.

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

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

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

g$|$End$()$;