Data Sufficiency (DS) | Re: In the figure, is the line AB perpendicular to the line CD?

If AB & CD are intersecting lines, then x is equal to y.
Only then we can make out from stat1 that x+y=180, therefore 2y=180 making y equal to 90.
In the stat 2, it says that triangle AOC is Isoc,meaning AO & OC are equal sides since angle AOC is y°, and one other angle is given to be y°/2. Hence, again 2y=180, therefore AB is perpendicular to CD.
Correct answer is D, please amend the OA.

Posted from my mobile device
...

---