Question 549026
{{{drawing(400,200,-1.3,1.3,-.3,1.3, line(-1,0,1,0),line(0,0,0,1),
locate(-1,0,W),locate(1,0,Y), locate(0,0,X), locate(0,1,Z) )}}}

Angle ZXY is half of an 180° angle so it is a 90° angle, choice G)

Edwin</pre>