How do you find the outside angles of a triangle when you only have one outside angle? The outside angle given is 160 degrees. The two other angles are 13x and 7x.

Question

anonymous · Answer

Well, remember that the the exterior angles of a triangle always add to 360°.

So 
160+13x+7x=360

Then you solve that ecuation and find x.

anonymous · Answer

oh wait
x=10 then?
according to my book it's x =20, so I'm not sure how to reach that

anonymous · Answer

We have to be sure of what angles has measures 7x and 13x.

If the measures of the other two EXTERIOR angles are 13x and 7x, then the answer is 10.
If the measures os the other two EXTERIOR angles were 3x and 7x, then the answer is 20.
If 7x and 13x are the measures of other internal angles then we have other answer.

anonymous · Answer

I'm sorry about that. I was looking at the wrong questions answers. The answer for this question is 10. Thank you for the help.

anonymous · Answer

Welcome.