Which of this diagram show(s) the correct method of constructing a perpendicular line PQ at a given X on

From the diagram, which of the following statements is/are correct?

I. XQ is a radius of a centre Q

II. $\left| XQ \right|=\left| QY \right|$

III. $\left| QX \right|=\left| XY \right|$

In the diagram $\angle ROS={{66}^{\circ }}$and $\angle POQ=3x$ .Some construction lines are shown. Calculate the value of x

Which of the following can be constructed using a ruler and a pair of compass only