Question

I've got a trigonometry question I need help with. Just give me a second to draw a diagram.

Answer 1

I need to workout any of the angles in the triangle

Answer 2

are you sure it's \[180^{o}\] ?

Answer 3

Oh, silly me its 140 degrees. Sorry.

Answer 4

use sinus cosinus or tan..

Answer 5

But its a non right angle triange

Answer 6

wait

Answer 7

yeah, I just realise that, sorry dude ):

Answer 8

All good :)

Answer 9

how if you extend the triangle?

Answer 10

would it work?

Answer 11

i found it...
I think... try to extend the triangle, use congruency and finally, sine cosine or tan... is it allowed?

Answer 12

Looks good to me :) Thanks a lot for your help!