Help :D

" Figure 1 is showing a model of a tablet. The cover is foldable. This will create a triangle |BC|=3,4
The tablet is connected in the cover 0.5cm down on one side shown on the figure. The tablets glas-surface is 13.5 cm from top to bottom. 

a) Prove the angles in triangle ABC 

B) Prove the angle v, as the tablet connects with. 

http://imgur.com/a/agpUw
This is where im at.. Looks good? 

I'm confused

You have written on the pic  BC=5

but in the writing it says  |BC|=3,4       do you mean 3.4?

Anyway, what is BC?

It's 3.4 :) 

Given that you know all three sides of the first triangle, I think the best way to start off would be to use the cosine law to find one of the angles.  From there, you can use the sine law to prove the other two angles.