How do u convert relative angle to absolute angles?

[Luongo]

ie: in the figure theta 3 i got i want theta 2 what formula would i use

 

[Luongo]

ie: in the figure theta 3 i got i want theta 2 what formula would i use

help please

 

[Stonebridge]

I think it's th2=th1+th3-180

 

[D H]

There isn't enough information to tell.

 

[Stonebridge]

It's basic geometry.
Assuming the line I've drawn is parallel to the x axis

th2 = th3 -th
and
th = 180 - th1
Therefore
th2 = th1 + th3 - 180