Let \(\theta \) be an angle such that P is the terminal point of \(\theta \):
Some of the points Q,S,R,T can be the terminal point of \(\theta \)/2.
Not sure what \(\theta \)/2 looks like, any advice?
The possible terminal points of \(\theta/2\) are R and T.
You can find the answer posted here: http://2baksa.ws
The angle \(\theta\) goes anti-clockwise from the positive x-axis around to the red line. The angle \(\theta/2\) would go half-way (again in an anti-clockwise direction) from the positive x-axis towards the red line. It would therefore get to point Q.