Is it 30?

It only took me like 5 - 10 mins to do, so I'm probably wrong I guess.

I just used the rule of triangles with 180 degrees, the hole "when two lines intersect, their opposite angles are the same" thing...did anyone remember that one? And the angle of a flat line is 180 and if you draw a circle around an intersection it's angles all add up to 360 degrees

for instance. That X in the middle of the Big triangle where 4 different ones are created, all those angles add up to be 360 and the two angles opposite of each other are the same.

I got 130 and 50. 130 x 2 + 50 x 2 = 360

someone tell me if I'm right. I suck at proofs. I used to have my friend do it for me after I solved the equation in Calc.

EDIT: crap I don't know if ti makes a difference, but I forgot about the side angle side thing and I'm pretty sure I don't even remember how to do it anyway.