Okay as little Gwent as possible. Otherwise you will get hooked on it until you burn out and stop playing the game entirely because you've forgotten all the storyline and mechanics.
Since its main purpose is to cover your genitals, none of the above.
If it is just to protect the legs then 2 or 3 does the job, but 2 looks impossible to create in reality unless you sew it around the spider. Maybe we are assuming the spider spins this around itself with its webs so maybe that will work.
Even if it was a right angle, I think a second assumption is that the top left and bottom lines are equal length, which is also not stated.
I think there's just not enough information in this picture to calculate the angle, and it can only be determined by measuring. But the image also does not specify that it is drawn to scale.
This analogy doesn't really make sense