Question

Which of these triangles can you use the law of cosines to solve for a missing side?

Answer 1

the second one- For future people who have this question

Explanation:

Answer 2

correct answer is option second

Explanation:

We can apply law of cosines in triangle given in option 2 to determine third side

in this triangle two sides are given as 8 and 12

By applying law of cosines in triangle given in option 2

`x^2 = 8^2 + 12^2-2* 8* 12cos(138)`...................(1)

by solving equatin 1 we can determine value of x so option 2 triangle can be use for applying law of cosines to determine for a missing side x